BASELINE: Update Chromium to 61.0.3163.99

Change-Id: I8452f34574d88ca2b27af9bd56fc9ff3f16b1367
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

9 files changed, 465 insertions, 120 deletions

diff --git a/chromium/v8/include/APIDesign.md b/chromium/v8/include/APIDesign.md
new file mode 100644
index 00000000000..8830fff7d18
--- /dev/null
+++ b/chromium/v8/include/APIDesign.md
@@ -0,0 +1,69 @@
+# The V8 public C++ API
+
+# Overview
+
+The V8 public C++ API aims to support four use cases:
+
+1. Enable applications that embed V8 (called the embedder) to configure and run
+   one or more instances of V8.
+2. Expose ECMAScript-like capabilities to the embedder.
+3. Enable the embedder to interact with ECMAScript by exposing API objects.
+4. Provide access to the V8 debugger (inspector).
+
+# Configuring and running an instance of V8
+
+V8 requires access to certain OS-level primitives such as the ability to
+schedule work on threads, or allocate memory.
+
+The embedder can define how to access those primitives via the v8::Platform
+interface. While V8 bundles a basic implementation, embedders are highly
+encouraged to implement v8::Platform themselves.
+
+Currently, the v8::ArrayBuffer::Allocator is passed to the v8::Isolate factory
+method, however, conceptually it should also be part of the v8::Platform since
+all instances of V8 should share one allocator.
+
+Once the v8::Platform is configured, an v8::Isolate can be created. All
+further interactions with V8 should explicitly reference the v8::Isolate they
+refer to. All API methods should eventually take an v8::Isolate parameter.
+
+When a given instance of V8 is no longer needed, it can be destroyed by
+disposing the respective v8::Isolate. If the embedder wishes to free all memory
+associated with the v8::Isolate, it has to first clear all global handles
+associated with that v8::Isolate.
+
+# ECMAScript-like capabilities
+
+In general, the C++ API shouldn't enable capabilities that aren't available to
+scripts running in V8. Experience has shown that it's not possible to maintain
+such API methods in the long term. However, capabilities also available to
+scripts, i.e., ones that are defined in the ECMAScript standard are there to
+stay, and we can safely expose them to embedders.
+
+The C++ API should also be pleasant to use, and not require learning new
+paradigms. Similarly to how the API exposed to scripts aims to provide good
+ergonomics, we should aim to provide a reasonable developer experience for this
+API surface.
+
+ECMAScript makes heavy use of exceptions, however, V8's C++ code doesn't use
+C++ exceptions. Therefore, all API methods that can throw exceptions should
+indicate so by returning a v8::Maybe<> or v8::MaybeLocal<> result,
+and by taking a v8::Local<v8::Context> parameter that indicates in which
+context a possible exception should be thrown.
+
+# API objects
+
+V8 allows embedders to define special objects that expose additional
+capabilities and APIs to scripts. The most prominent example is exposing the
+HTML DOM in Blink. Other examples are e.g. node.js. It is less clear what kind
+of capabilities we want to expose via this API surface. As a rule of thumb, we
+want to expose operations as defined in the WebIDL and HTML spec: we
+assume that those requirements are somewhat stable, and that they are a
+superset of the requirements of other embedders including node.js.
+
+Ideally, the API surfaces defined in those specs hook into the ECMAScript spec
+which in turn guarantees long-term stability of the API.
+
+# The V8 inspector
+
+All debugging capabilities of V8 should be exposed via the inspector protocol.
diff --git a/chromium/v8/include/OWNERS b/chromium/v8/include/OWNERS
index 07f8a610c5f..28f038f80b2 100644
--- a/chromium/v8/include/OWNERS
+++ b/chromium/v8/include/OWNERS
@@ -1,7 +1,9 @@
+adamk@chromium.org
 danno@chromium.org
-jochen@chromium.org
 
 per-file v8-inspector.h=dgozman@chromium.org
 per-file v8-inspector.h=pfeldman@chromium.org
 per-file v8-inspector-protocol.h=dgozman@chromium.org
 per-file v8-inspector-protocol.h=pfeldman@chromium.org
+
+# COMPONENT: Blink>JavaScript>API
diff --git a/chromium/v8/include/PRESUBMIT.py b/chromium/v8/include/PRESUBMIT.py
new file mode 100644
index 00000000000..386f2e50061
--- /dev/null
+++ b/chromium/v8/include/PRESUBMIT.py
@@ -0,0 +1,29 @@
+# Copyright 2017 the V8 project authors. All rights reserved.')
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Presubmit script for //v8/include
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into depot_tools.
+"""
+
+import os
+
+
+def PostUploadHook(cl, change, output_api):
+  """git cl upload will call this hook after the issue is created/modified.
+
+  This hook adds extra try bots to the CL description in order to run layout
+  tests in addition to CQ try bots.
+  """
+  def header_filter(f):
+    return '.h' in os.path.split(f.LocalPath())[1]
+  if not change.AffectedFiles(file_filter=header_filter):
+    return []
+  return output_api.EnsureCQIncludeTrybotsAreAdded(
+    cl,
+    [
+      'master.tryserver.chromium.linux:linux_chromium_rel_ng'
+    ],
+    'Automatically added layout test trybots to run tests on CQ.')
diff --git a/chromium/v8/include/libplatform/libplatform.h b/chromium/v8/include/libplatform/libplatform.h
index e9450456299..b615088300e 100644
--- a/chromium/v8/include/libplatform/libplatform.h
+++ b/chromium/v8/include/libplatform/libplatform.h
@@ -30,12 +30,15 @@ enum class MessageLoopBehavior : bool {
  * If |idle_task_support| is enabled then the platform will accept idle
  * tasks (IdleTasksEnabled will return true) and will rely on the embedder
  * calling v8::platform::RunIdleTasks to process the idle tasks.
+ * If |tracing_controller| is nullptr, the default platform will create a
+ * v8::platform::TracingController instance and use it.
  */
 V8_PLATFORM_EXPORT v8::Platform* CreateDefaultPlatform(
     int thread_pool_size = 0,
     IdleTaskSupport idle_task_support = IdleTaskSupport::kDisabled,
     InProcessStackDumping in_process_stack_dumping =
-        InProcessStackDumping::kEnabled);
+        InProcessStackDumping::kEnabled,
+    v8::TracingController* tracing_controller = nullptr);
 
 /**
  * Pumps the message loop for the given isolate.
@@ -67,6 +70,8 @@ V8_PLATFORM_EXPORT void RunIdleTasks(v8::Platform* platform,
  * Attempts to set the tracing controller for the given platform.
  *
  * The |platform| has to be created using |CreateDefaultPlatform|.
+ *
+ * DEPRECATED: Will be removed soon.
  */
 V8_PLATFORM_EXPORT void SetTracingController(
     v8::Platform* platform,
diff --git a/chromium/v8/include/libplatform/v8-tracing.h b/chromium/v8/include/libplatform/v8-tracing.h
index 902f8ea93db..8c1febf7627 100644
--- a/chromium/v8/include/libplatform/v8-tracing.h
+++ b/chromium/v8/include/libplatform/v8-tracing.h
@@ -209,7 +209,15 @@ class V8_PLATFORM_EXPORT TraceConfig {
   void operator=(const TraceConfig&) = delete;
 };
 
-class V8_PLATFORM_EXPORT TracingController {
+#if defined(_MSC_VER)
+#define V8_PLATFORM_NON_EXPORTED_BASE(code) \
+  __pragma(warning(suppress : 4275)) code
+#else
+#define V8_PLATFORM_NON_EXPORTED_BASE(code) code
+#endif  // defined(_MSC_VER)
+
+class V8_PLATFORM_EXPORT TracingController
+    : public V8_PLATFORM_NON_EXPORTED_BASE(v8::TracingController) {
  public:
   enum Mode { DISABLED = 0, RECORDING_MODE };
 
@@ -227,25 +235,29 @@ class V8_PLATFORM_EXPORT TracingController {
   };
 
   TracingController();
-  ~TracingController();
+  ~TracingController() override;
   void Initialize(TraceBuffer* trace_buffer);
-  const uint8_t* GetCategoryGroupEnabled(const char* category_group);
-  static const char* GetCategoryGroupName(const uint8_t* category_enabled_flag);
+
+  // v8::TracingController implementation.
+  const uint8_t* GetCategoryGroupEnabled(const char* category_group) override;
   uint64_t AddTraceEvent(
       char phase, const uint8_t* category_enabled_flag, const char* name,
       const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
       const char** arg_names, const uint8_t* arg_types,
       const uint64_t* arg_values,
       std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables,
-      unsigned int flags);
+      unsigned int flags) override;
   void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
-                                const char* name, uint64_t handle);
+                                const char* name, uint64_t handle) override;
+  void AddTraceStateObserver(
+      v8::TracingController::TraceStateObserver* observer) override;
+  void RemoveTraceStateObserver(
+      v8::TracingController::TraceStateObserver* observer) override;
 
   void StartTracing(TraceConfig* trace_config);
   void StopTracing();
 
-  void AddTraceStateObserver(Platform::TraceStateObserver* observer);
-  void RemoveTraceStateObserver(Platform::TraceStateObserver* observer);
+  static const char* GetCategoryGroupName(const uint8_t* category_enabled_flag);
 
  private:
   const uint8_t* GetCategoryGroupEnabledInternal(const char* category_group);
@@ -255,7 +267,7 @@ class V8_PLATFORM_EXPORT TracingController {
   std::unique_ptr<TraceBuffer> trace_buffer_;
   std::unique_ptr<TraceConfig> trace_config_;
   std::unique_ptr<base::Mutex> mutex_;
-  std::unordered_set<Platform::TraceStateObserver*> observers_;
+  std::unordered_set<v8::TracingController::TraceStateObserver*> observers_;
   Mode mode_ = DISABLED;
 
   // Disallow copy and assign
@@ -263,6 +275,8 @@ class V8_PLATFORM_EXPORT TracingController {
   void operator=(const TracingController&) = delete;
 };
 
+#undef V8_PLATFORM_NON_EXPORTED_BASE
+
 }  // namespace tracing
 }  // namespace platform
 }  // namespace v8
diff --git a/chromium/v8/include/v8-platform.h b/chromium/v8/include/v8-platform.h
index 8f6d8042abd..3df78a81c0a 100644
--- a/chromium/v8/include/v8-platform.h
+++ b/chromium/v8/include/v8-platform.h
@@ -53,6 +53,66 @@ class ConvertableToTraceFormat {
 };
 
 /**
+ * V8 Tracing controller.
+ *
+ * Can be implemented by an embedder to record trace events from V8.
+ */
+class TracingController {
+ public:
+  virtual ~TracingController() = default;
+
+  /**
+   * Called by TRACE_EVENT* macros, don't call this directly.
+   * The name parameter is a category group for example:
+   * TRACE_EVENT0("v8,parse", "V8.Parse")
+   * The pointer returned points to a value with zero or more of the bits
+   * defined in CategoryGroupEnabledFlags.
+   **/
+  virtual const uint8_t* GetCategoryGroupEnabled(const char* name) {
+    static uint8_t no = 0;
+    return &no;
+  }
+
+  /**
+   * Adds a trace event to the platform tracing system. This function call is
+   * usually the result of a TRACE_* macro from trace_event_common.h when
+   * tracing and the category of the particular trace are enabled. It is not
+   * advisable to call this function on its own; it is really only meant to be
+   * used by the trace macros. The returned handle can be used by
+   * UpdateTraceEventDuration to update the duration of COMPLETE events.
+   */
+  virtual uint64_t AddTraceEvent(
+      char phase, const uint8_t* category_enabled_flag, const char* name,
+      const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
+      const char** arg_names, const uint8_t* arg_types,
+      const uint64_t* arg_values,
+      std::unique_ptr<ConvertableToTraceFormat>* arg_convertables,
+      unsigned int flags) {
+    return 0;
+  }
+
+  /**
+   * Sets the duration field of a COMPLETE trace event. It must be called with
+   * the handle returned from AddTraceEvent().
+   **/
+  virtual void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
+                                        const char* name, uint64_t handle) {}
+
+  class TraceStateObserver {
+   public:
+    virtual ~TraceStateObserver() = default;
+    virtual void OnTraceEnabled() = 0;
+    virtual void OnTraceDisabled() = 0;
+  };
+
+  /** Adds tracing state change observer. */
+  virtual void AddTraceStateObserver(TraceStateObserver*) {}
+
+  /** Removes tracing state change observer. */
+  virtual void RemoveTraceStateObserver(TraceStateObserver*) {}
+};
+
+/**
  * V8 Platform abstraction layer.
  *
  * The embedder has to provide an implementation of this interface before
@@ -135,6 +195,20 @@ class Platform {
    * the epoch.
    **/
   virtual double MonotonicallyIncreasingTime() = 0;
+  typedef void (*StackTracePrinter)();
+
+  /**
+   * Returns a function pointer that print a stack trace of the current stack
+   * on invocation. Disables printing of the stack trace if nullptr.
+   */
+  virtual StackTracePrinter GetStackTracePrinter() { return nullptr; }
+
+  /**
+   * Returns an instance of a v8::TracingController. This must be non-nullptr.
+   */
+  virtual TracingController* GetTracingController() = 0;
+
+  // DEPRECATED methods, use TracingController interface instead.
 
   /**
    * Called by TRACE_EVENT* macros, don't call this directly.
@@ -200,26 +274,13 @@ class Platform {
   virtual void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
                                         const char* name, uint64_t handle) {}
 
-  class TraceStateObserver {
-   public:
-    virtual ~TraceStateObserver() = default;
-    virtual void OnTraceEnabled() = 0;
-    virtual void OnTraceDisabled() = 0;
-  };
+  typedef v8::TracingController::TraceStateObserver TraceStateObserver;
 
   /** Adds tracing state change observer. */
   virtual void AddTraceStateObserver(TraceStateObserver*) {}
 
   /** Removes tracing state change observer. */
   virtual void RemoveTraceStateObserver(TraceStateObserver*) {}
-
-  typedef void (*StackTracePrinter)();
-
-  /**
-   * Returns a function pointer that print a stack trace of the current stack
-   * on invocation. Disables printing of the stack trace if nullptr.
-   */
-  virtual StackTracePrinter GetStackTracePrinter() { return nullptr; }
 };
 
 }  // namespace v8
diff --git a/chromium/v8/include/v8-version.h b/chromium/v8/include/v8-version.h
index b89bb0fe9c6..6e42708504c 100644
--- a/chromium/v8/include/v8-version.h
+++ b/chromium/v8/include/v8-version.h
@@ -9,9 +9,9 @@
 // NOTE these macros are used by some of the tool scripts and the build
 // system so their names cannot be changed without changing the scripts.
 #define V8_MAJOR_VERSION 6
-#define V8_MINOR_VERSION 0
-#define V8_BUILD_NUMBER 286
-#define V8_PATCH_LEVEL 57
+#define V8_MINOR_VERSION 1
+#define V8_BUILD_NUMBER 534
+#define V8_PATCH_LEVEL 39
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/chromium/v8/include/v8.h b/chromium/v8/include/v8.h
index da3cdfdcbd7..2f9bc602366 100644
--- a/chromium/v8/include/v8.h
+++ b/chromium/v8/include/v8.h
@@ -869,8 +869,6 @@ class V8_EXPORT HandleScope {
 
   HandleScope(const HandleScope&) = delete;
   void operator=(const HandleScope&) = delete;
-  void* operator new(size_t size);
-  void operator delete(void*, size_t);
 
  protected:
   V8_INLINE HandleScope() {}
@@ -881,6 +879,13 @@ class V8_EXPORT HandleScope {
                                          internal::Object* value);
 
  private:
+  // Declaring operator new and delete as deleted is not spec compliant.
+  // Therefore declare them private instead to disable dynamic alloc
+  void* operator new(size_t size);
+  void* operator new[](size_t size);
+  void operator delete(void*, size_t);
+  void operator delete[](void*, size_t);
+
   // Uses heap_object to obtain the current Isolate.
   static internal::Object** CreateHandle(internal::HeapObject* heap_object,
                                          internal::Object* value);
@@ -921,10 +926,15 @@ class V8_EXPORT EscapableHandleScope : public HandleScope {
 
   EscapableHandleScope(const EscapableHandleScope&) = delete;
   void operator=(const EscapableHandleScope&) = delete;
+
+ private:
+  // Declaring operator new and delete as deleted is not spec compliant.
+  // Therefore declare them private instead to disable dynamic alloc
   void* operator new(size_t size);
+  void* operator new[](size_t size);
   void operator delete(void*, size_t);
+  void operator delete[](void*, size_t);
 
- private:
   internal::Object** Escape(internal::Object** escape_value);
   internal::Object** escape_slot_;
 };
@@ -941,10 +951,15 @@ class V8_EXPORT SealHandleScope {
 
   SealHandleScope(const SealHandleScope&) = delete;
   void operator=(const SealHandleScope&) = delete;
+
+ private:
+  // Declaring operator new and delete as deleted is not spec compliant.
+  // Therefore declare them private instead to disable dynamic alloc
   void* operator new(size_t size);
+  void* operator new[](size_t size);
   void operator delete(void*, size_t);
+  void operator delete[](void*, size_t);
 
- private:
   internal::Isolate* const isolate_;
   internal::Object** prev_limit_;
   int prev_sealed_level_;
@@ -1016,9 +1031,6 @@ class ScriptOrigin {
   V8_INLINE Local<Value> ResourceName() const;
   V8_INLINE Local<Integer> ResourceLineOffset() const;
   V8_INLINE Local<Integer> ResourceColumnOffset() const;
-  /**
-    * Returns true for embedder's debugger scripts
-    */
   V8_INLINE Local<Integer> ScriptID() const;
   V8_INLINE Local<Value> SourceMapUrl() const;
   V8_INLINE ScriptOriginOptions Options() const { return options_; }
@@ -1032,7 +1044,6 @@ class ScriptOrigin {
   Local<Value> source_map_url_;
 };
 
-
 /**
  * A compiled JavaScript script, not yet tied to a Context.
  */
@@ -1065,6 +1076,22 @@ class V8_EXPORT UnboundScript {
 };
 
 /**
+ * A location in JavaScript source.
+ */
+class V8_EXPORT Location {
+ public:
+  int GetLineNumber() { return line_number_; }
+  int GetColumnNumber() { return column_number_; }
+
+  Location(int line_number, int column_number)
+      : line_number_(line_number), column_number_(column_number) {}
+
+ private:
+  int line_number_;
+  int column_number_;
+};
+
+/**
  * This is an unfinished experimental feature, and is only exposed
  * here for internal testing purposes. DO NOT USE.
  *
@@ -1073,6 +1100,28 @@ class V8_EXPORT UnboundScript {
 class V8_EXPORT Module {
  public:
   /**
+   * The different states a module can be in.
+   */
+  enum Status {
+    kUninstantiated,
+    kInstantiating,
+    kInstantiated,
+    kEvaluating,
+    kEvaluated,
+    kErrored
+  };
+
+  /**
+   * Returns the module's current status.
+   */
+  Status GetStatus() const;
+
+  /**
+   * For a module in kErrored status, this returns the corresponding exception.
+   */
+  Local<Value> GetException() const;
+
+  /**
    * Returns the number of modules requested by this module.
    */
   int GetModuleRequestsLength() const;
@@ -1084,6 +1133,12 @@ class V8_EXPORT Module {
   Local<String> GetModuleRequest(int i) const;
 
   /**
+   * Returns the source location (line number and column number) of the ith
+   * module specifier's first occurrence in this module.
+   */
+  Location GetModuleRequestLocation(int i) const;
+
+  /**
    * Returns the identity hash for this object.
    */
   int GetIdentityHash() const;
@@ -1095,40 +1150,29 @@ class V8_EXPORT Module {
   /**
    * ModuleDeclarationInstantiation
    *
-   * Returns false if an exception occurred during instantiation. (In the case
-   * where the callback throws an exception, that exception is propagated.)
+   * Returns an empty Maybe<bool> if an exception occurred during
+   * instantiation. (In the case where the callback throws an exception, that
+   * exception is propagated.)
    */
-  V8_WARN_UNUSED_RESULT bool Instantiate(Local<Context> context,
-                                         ResolveCallback callback);
+  V8_DEPRECATED("Use Maybe<bool> version",
+                bool Instantiate(Local<Context> context,
+                                 ResolveCallback callback));
+  V8_WARN_UNUSED_RESULT Maybe<bool> InstantiateModule(Local<Context> context,
+                                                      ResolveCallback callback);
 
   /**
    * ModuleEvaluation
    *
    * Returns the completion value.
+   * TODO(neis): Be more precise or say nothing.
    */
   V8_WARN_UNUSED_RESULT MaybeLocal<Value> Evaluate(Local<Context> context);
-};
-
-/**
- * This is an unfinished experimental feature, and is only exposed
- * here for internal testing purposes. DO NOT USE.
- *
- * A compiled JavaScript module.
- */
-class V8_EXPORT DynamicImportResult {
- public:
-  /**
-   * Resolves the promise with the namespace object of the given
-   * module.
-   */
-  V8_WARN_UNUSED_RESULT bool FinishDynamicImportSuccess(Local<Context> context,
-                                                        Local<Module> module);
 
   /**
-   * Rejects the promise with the given exception.
+   * Returns the namespace object of this module. The module must have
+   * been successfully instantiated before and must not be errored.
    */
-  V8_WARN_UNUSED_RESULT bool FinishDynamicImportFailure(Local<Context> context,
-                                                        Local<Value> exception);
+  Local<Value> GetModuleNamespace();
 };
 
 /**
@@ -3053,12 +3097,9 @@ class V8_EXPORT Object : public Value {
   //
   // Note also that this only works for named properties.
   V8_DEPRECATED("Use CreateDataProperty / DefineOwnProperty",
-                bool ForceSet(Local<Value> key, Local<Value> value,
-                              PropertyAttribute attribs = None));
-  V8_DEPRECATE_SOON("Use CreateDataProperty / DefineOwnProperty",
-                    Maybe<bool> ForceSet(Local<Context> context,
-                                         Local<Value> key, Local<Value> value,
-                                         PropertyAttribute attribs = None));
+                Maybe<bool> ForceSet(Local<Context> context, Local<Value> key,
+                                     Local<Value> value,
+                                     PropertyAttribute attribs = None));
 
   V8_DEPRECATE_SOON("Use maybe version", Local<Value> Get(Local<Value> key));
   V8_WARN_UNUSED_RESULT MaybeLocal<Value> Get(Local<Context> context,
@@ -4247,7 +4288,18 @@ class V8_EXPORT ArrayBuffer : public Object {
    */
   class V8_EXPORT Contents { // NOLINT
    public:
-    Contents() : data_(NULL), byte_length_(0) {}
+    Contents()
+        : data_(nullptr),
+          byte_length_(0),
+          allocation_base_(nullptr),
+          allocation_length_(0),
+          allocation_mode_(Allocator::AllocationMode::kNormal) {}
+
+    void* AllocationBase() const { return allocation_base_; }
+    size_t AllocationLength() const { return allocation_length_; }
+    Allocator::AllocationMode AllocationMode() const {
+      return allocation_mode_;
+    }
 
     void* Data() const { return data_; }
     size_t ByteLength() const { return byte_length_; }
@@ -4255,6 +4307,9 @@ class V8_EXPORT ArrayBuffer : public Object {
    private:
     void* data_;
     size_t byte_length_;
+    void* allocation_base_;
+    size_t allocation_length_;
+    Allocator::AllocationMode allocation_mode_;
 
     friend class ArrayBuffer;
   };
@@ -4603,7 +4658,18 @@ class V8_EXPORT SharedArrayBuffer : public Object {
    */
   class V8_EXPORT Contents {  // NOLINT
    public:
-    Contents() : data_(NULL), byte_length_(0) {}
+    Contents()
+        : data_(nullptr),
+          byte_length_(0),
+          allocation_base_(nullptr),
+          allocation_length_(0),
+          allocation_mode_(ArrayBuffer::Allocator::AllocationMode::kNormal) {}
+
+    void* AllocationBase() const { return allocation_base_; }
+    size_t AllocationLength() const { return allocation_length_; }
+    ArrayBuffer::Allocator::AllocationMode AllocationMode() const {
+      return allocation_mode_;
+    }
 
     void* Data() const { return data_; }
     size_t ByteLength() const { return byte_length_; }
@@ -4611,6 +4677,9 @@ class V8_EXPORT SharedArrayBuffer : public Object {
    private:
     void* data_;
     size_t byte_length_;
+    void* allocation_base_;
+    size_t allocation_length_;
+    ArrayBuffer::Allocator::AllocationMode allocation_mode_;
 
     friend class SharedArrayBuffer;
   };
@@ -4857,6 +4926,7 @@ class V8_EXPORT External : public Value {
   F(ArrayProto_forEach, array_for_each_iterator) \
   F(ArrayProto_keys, array_keys_iterator)        \
   F(ArrayProto_values, array_values_iterator)    \
+  F(ErrorPrototype, initial_error_prototype)     \
   F(IteratorPrototype, initial_iterator_prototype)
 
 enum Intrinsic {
@@ -5921,6 +5991,8 @@ V8_INLINE Local<Boolean> False(Isolate* isolate);
  *
  * The arguments for set_max_semi_space_size, set_max_old_space_size,
  * set_max_executable_size, set_code_range_size specify limits in MB.
+ *
+ * The argument for set_max_semi_space_size_in_kb is in KB.
  */
 class V8_EXPORT ResourceConstraints {
  public:
@@ -5938,10 +6010,28 @@ class V8_EXPORT ResourceConstraints {
   void ConfigureDefaults(uint64_t physical_memory,
                          uint64_t virtual_memory_limit);
 
-  int max_semi_space_size() const { return max_semi_space_size_; }
-  void set_max_semi_space_size(int limit_in_mb) {
-    max_semi_space_size_ = limit_in_mb;
+  // Returns the max semi-space size in MB.
+  V8_DEPRECATE_SOON("Use max_semi_space_size_in_kb()",
+                    int max_semi_space_size()) {
+    return static_cast<int>(max_semi_space_size_in_kb_ / 1024);
   }
+
+  // Sets the max semi-space size in MB.
+  V8_DEPRECATE_SOON("Use set_max_semi_space_size_in_kb(size_t limit_in_kb)",
+                    void set_max_semi_space_size(int limit_in_mb)) {
+    max_semi_space_size_in_kb_ = limit_in_mb * 1024;
+  }
+
+  // Returns the max semi-space size in KB.
+  size_t max_semi_space_size_in_kb() const {
+    return max_semi_space_size_in_kb_;
+  }
+
+  // Sets the max semi-space size in KB.
+  void set_max_semi_space_size_in_kb(size_t limit_in_kb) {
+    max_semi_space_size_in_kb_ = limit_in_kb;
+  }
+
   int max_old_space_size() const { return max_old_space_size_; }
   void set_max_old_space_size(int limit_in_mb) {
     max_old_space_size_ = limit_in_mb;
@@ -5967,7 +6057,10 @@ class V8_EXPORT ResourceConstraints {
   }
 
  private:
-  int max_semi_space_size_;
+  // max_semi_space_size_ is in KB
+  size_t max_semi_space_size_in_kb_;
+
+  // The remaining limits are in MB
   int max_old_space_size_;
   int max_executable_size_;
   uint32_t* stack_limit_;
@@ -6055,21 +6148,23 @@ typedef void (*DeprecatedCallCompletedCallback)();
 /**
  * HostImportDynamicallyCallback is called when we require the
  * embedder to load a module. This is used as part of the dynamic
- * import syntax. The behavior of this callback is not specified in
- * EcmaScript.
+ * import syntax.
  *
  * The referrer is the name of the file which calls the dynamic
  * import. The referrer can be used to resolve the module location.
  *
  * The specifier is the name of the module that should be imported.
  *
- * The DynamicImportResult object is used to signal success or failure
- * by calling it's respective methods.
+ * The embedder must compile, instantiate, evaluate the Module, and
+ * obtain it's namespace object.
  *
+ * The Promise returned from this function is forwarded to userland
+ * JavaScript. The embedder must resolve this promise with the module
+ * namespace object. In case of an exception, the embedder must reject
+ * this promise with the exception.
  */
-typedef void (*HostImportModuleDynamicallyCallback)(
-    Isolate* isolate, Local<String> referrer, Local<String> specifier,
-    Local<DynamicImportResult> result);
+typedef MaybeLocal<Promise> (*HostImportModuleDynamicallyCallback)(
+    Local<Context> context, Local<String> referrer, Local<String> specifier);
 
 /**
  * PromiseHook with type kInit is called when a new promise is
@@ -6192,11 +6287,18 @@ typedef void (*FailedAccessCheckCallback)(Local<Object> target,
  * Callback to check if code generation from strings is allowed. See
  * Context::AllowCodeGenerationFromStrings.
  */
-typedef bool (*AllowCodeGenerationFromStringsCallback)(Local<Context> context);
+typedef bool (*DeprecatedAllowCodeGenerationFromStringsCallback)(
+    Local<Context> context);
+typedef bool (*AllowCodeGenerationFromStringsCallback)(Local<Context> context,
+                                                       Local<String> source);
 
-// --- WASM compilation callbacks ---
+// --- WebAssembly compilation callbacks ---
 typedef bool (*ExtensionCallback)(const FunctionCallbackInfo<Value>&);
 
+// --- Callback for APIs defined on v8-supported objects, but implemented
+// by the embedder. Example: WebAssembly.{compile|instantiate}Streaming ---
+typedef void (*ApiImplementationCallback)(const FunctionCallbackInfo<Value>&);
+
 // --- Garbage Collection Callbacks ---
 
 /**
@@ -6620,8 +6722,7 @@ class V8_EXPORT Isolate {
           add_histogram_sample_callback(nullptr),
           array_buffer_allocator(nullptr),
           external_references(nullptr),
-          allow_atomics_wait(true),
-          host_import_module_dynamically_callback_(nullptr) {}
+          allow_atomics_wait(true) {}
 
     /**
      * The optional entry_hook allows the host application to provide the
@@ -6684,16 +6785,6 @@ class V8_EXPORT Isolate {
      * this isolate. This can also be configured via SetAllowAtomicsWait.
      */
     bool allow_atomics_wait;
-
-    /**
-     * This is an unfinished experimental feature, and is only exposed
-     * here for internal testing purposes. DO NOT USE.
-     *
-     * This specifies the callback called by the upcoming dynamic
-     * import() language feature to load modules.
-     */
-    HostImportModuleDynamicallyCallback
-        host_import_module_dynamically_callback_;
   };
 
 
@@ -6832,6 +6923,7 @@ class V8_EXPORT Isolate {
     kAssigmentExpressionLHSIsCallInSloppy = 36,
     kAssigmentExpressionLHSIsCallInStrict = 37,
     kPromiseConstructorReturnedUndefined = 38,
+    kConstructorNonUndefinedPrimitiveReturn = 39,
 
     // If you add new values here, you'll also need to update Chromium's:
     // UseCounter.h, V8PerIsolateData.cpp, histograms.xml
@@ -6885,6 +6977,16 @@ class V8_EXPORT Isolate {
       AbortOnUncaughtExceptionCallback callback);
 
   /**
+   * This is an unfinished experimental feature, and is only exposed
+   * here for internal testing purposes. DO NOT USE.
+   *
+   * This specifies the callback called by the upcoming dynamic
+   * import() language feature to load modules.
+   */
+  void SetHostImportModuleDynamicallyCallback(
+      HostImportModuleDynamicallyCallback callback);
+
+  /**
    * Optional notification that the system is running low on memory.
    * V8 uses these notifications to guide heuristics.
    * It is allowed to call this function from another thread while
@@ -7082,6 +7184,12 @@ class V8_EXPORT Isolate {
   Local<Context> GetEnteredOrMicrotaskContext();
 
   /**
+   * Returns the Context that corresponds to the Incumbent realm in HTML spec.
+   * https://html.spec.whatwg.org/multipage/webappapis.html#incumbent
+   */
+  Local<Context> GetIncumbentContext();
+
+  /**
    * Schedules an exception to be thrown when returning to JavaScript.  When an
    * exception has been scheduled it is illegal to invoke any JavaScript
    * operation; the caller must return immediately and only after the exception
@@ -7133,6 +7241,17 @@ class V8_EXPORT Isolate {
    */
   void RemoveGCEpilogueCallback(GCCallback callback);
 
+  typedef size_t (*GetExternallyAllocatedMemoryInBytesCallback)();
+
+  /**
+   * Set the callback that tells V8 how much memory is currently allocated
+   * externally of the V8 heap. Ideally this memory is somehow connected to V8
+   * objects and may get freed-up when the corresponding V8 objects get
+   * collected by a V8 garbage collection.
+   */
+  void SetGetExternallyAllocatedMemoryInBytesCallback(
+      GetExternallyAllocatedMemoryInBytesCallback callback);
+
   /**
    * Forcefully terminate the current thread of JavaScript execution
    * in the given isolate.
@@ -7448,14 +7567,18 @@ class V8_EXPORT Isolate {
    */
   void SetAllowCodeGenerationFromStringsCallback(
       AllowCodeGenerationFromStringsCallback callback);
+  V8_DEPRECATED("Use callback with source parameter.",
+                void SetAllowCodeGenerationFromStringsCallback(
+                    DeprecatedAllowCodeGenerationFromStringsCallback callback));
 
   /**
-   * Embedder over{ride|load} injection points for wasm APIs.
+   * Embedder over{ride|load} injection points for wasm APIs. The expectation
+   * is that the embedder sets them at most once.
    */
   void SetWasmModuleCallback(ExtensionCallback callback);
-  void SetWasmCompileCallback(ExtensionCallback callback);
   void SetWasmInstanceCallback(ExtensionCallback callback);
-  void SetWasmInstantiateCallback(ExtensionCallback callback);
+
+  void SetWasmCompileStreamingCallback(ApiImplementationCallback callback);
 
   /**
   * Check if V8 is dead and therefore unusable.  This is the case after
@@ -7552,14 +7675,19 @@ class V8_EXPORT Isolate {
   ~Isolate() = delete;
   Isolate(const Isolate&) = delete;
   Isolate& operator=(const Isolate&) = delete;
+  // Deleting operator new and delete here is allowed as ctor and dtor is also
+  // deleted.
   void* operator new(size_t size) = delete;
+  void* operator new[](size_t size) = delete;
   void operator delete(void*, size_t) = delete;
+  void operator delete[](void*, size_t) = delete;
 
  private:
   template <class K, class V, class Traits>
   friend class PersistentValueMapBase;
 
   void ReportExternalAllocationLimitReached();
+  void CheckMemoryPressure();
 };
 
 class V8_EXPORT StartupData {
@@ -7607,8 +7735,9 @@ class V8_EXPORT V8 {
    * strings should be allowed.
    */
   V8_INLINE static V8_DEPRECATED(
-      "Use isolate version", void SetAllowCodeGenerationFromStringsCallback(
-                                 AllowCodeGenerationFromStringsCallback that));
+      "Use isolate version",
+      void SetAllowCodeGenerationFromStringsCallback(
+          DeprecatedAllowCodeGenerationFromStringsCallback that));
 
   /**
   * Check if V8 is dead and therefore unusable.  This is the case after
@@ -7919,7 +8048,7 @@ class V8_EXPORT V8 {
    */
   static void ShutdownPlatform();
 
-#if V8_OS_LINUX && V8_TARGET_ARCH_X64 && !V8_OS_ANDROID
+#if V8_OS_POSIX
   /**
    * Give the V8 signal handler a chance to handle a fault.
    *
@@ -7940,7 +8069,7 @@ class V8_EXPORT V8 {
    * points to a ucontext_t structure.
    */
   static bool TryHandleSignal(int signal_number, void* info, void* context);
-#endif  // V8_OS_LINUX
+#endif  // V8_OS_POSIX
 
   /**
    * Enable the default signal handler rather than using one provided by the
@@ -8279,10 +8408,15 @@ class V8_EXPORT TryCatch {
 
   TryCatch(const TryCatch&) = delete;
   void operator=(const TryCatch&) = delete;
+
+ private:
+  // Declaring operator new and delete as deleted is not spec compliant.
+  // Therefore declare them private instead to disable dynamic alloc
   void* operator new(size_t size);
+  void* operator new[](size_t size);
   void operator delete(void*, size_t);
+  void operator delete[](void*, size_t);
 
- private:
   void ResetInternal();
 
   internal::Isolate* isolate_;
@@ -8535,6 +8669,27 @@ class V8_EXPORT Context {
     Local<Context> context_;
   };
 
+  /**
+   * Stack-allocated class to support the backup incumbent settings object
+   * stack.
+   * https://html.spec.whatwg.org/multipage/webappapis.html#backup-incumbent-settings-object-stack
+   */
+  class BackupIncumbentScope {
+   public:
+    /**
+     * |backup_incumbent_context| is pushed onto the backup incumbent settings
+     * object stack.
+     */
+    explicit BackupIncumbentScope(Local<Context> backup_incumbent_context);
+    ~BackupIncumbentScope();
+
+   private:
+    friend class internal::Isolate;
+
+    Local<Context> backup_incumbent_context_;
+    const BackupIncumbentScope* prev_ = nullptr;
+  };
+
  private:
   friend class Value;
   friend class Script;
@@ -8782,6 +8937,8 @@ class Internals {
   static const int kExternalMemoryOffset = 4 * kApiPointerSize;
   static const int kExternalMemoryLimitOffset =
       kExternalMemoryOffset + kApiInt64Size;
+  static const int kExternalMemoryAtLastMarkCompactOffset =
+      kExternalMemoryLimitOffset + kApiInt64Size;
   static const int kIsolateRootsOffset = kExternalMemoryLimitOffset +
                                          kApiInt64Size + kApiInt64Size +
                                          kApiPointerSize + kApiPointerSize;
@@ -10000,13 +10157,32 @@ uint32_t Isolate::GetNumberOfDataSlots() {
 int64_t Isolate::AdjustAmountOfExternalAllocatedMemory(
     int64_t change_in_bytes) {
   typedef internal::Internals I;
+  const int64_t kMemoryReducerActivationLimit = 32 * 1024 * 1024;
   int64_t* external_memory = reinterpret_cast<int64_t*>(
       reinterpret_cast<uint8_t*>(this) + I::kExternalMemoryOffset);
-  const int64_t external_memory_limit = *reinterpret_cast<int64_t*>(
+  int64_t* external_memory_limit = reinterpret_cast<int64_t*>(
       reinterpret_cast<uint8_t*>(this) + I::kExternalMemoryLimitOffset);
+  int64_t* external_memory_at_last_mc =
+      reinterpret_cast<int64_t*>(reinterpret_cast<uint8_t*>(this) +
+                                 I::kExternalMemoryAtLastMarkCompactOffset);
   const int64_t amount = *external_memory + change_in_bytes;
+
   *external_memory = amount;
-  if (change_in_bytes > 0 && amount > external_memory_limit) {
+
+  int64_t allocation_diff_since_last_mc =
+      *external_memory_at_last_mc - *external_memory;
+  allocation_diff_since_last_mc = allocation_diff_since_last_mc < 0
+                                      ? -allocation_diff_since_last_mc
+                                      : allocation_diff_since_last_mc;
+  if (allocation_diff_since_last_mc > kMemoryReducerActivationLimit) {
+    CheckMemoryPressure();
+  }
+
+  if (change_in_bytes < 0) {
+    *external_memory_limit += change_in_bytes;
+  }
+
+  if (change_in_bytes > 0 && amount > *external_memory_limit) {
     ReportExternalAllocationLimitReached();
   }
   return *external_memory;
@@ -10036,11 +10212,11 @@ void* Context::GetAlignedPointerFromEmbedderData(int index) {
 #endif
 }
 
-
 void V8::SetAllowCodeGenerationFromStringsCallback(
-    AllowCodeGenerationFromStringsCallback callback) {
+    DeprecatedAllowCodeGenerationFromStringsCallback callback) {
   Isolate* isolate = Isolate::GetCurrent();
-  isolate->SetAllowCodeGenerationFromStringsCallback(callback);
+  isolate->SetAllowCodeGenerationFromStringsCallback(
+      reinterpret_cast<AllowCodeGenerationFromStringsCallback>(callback));
 }
 
 
diff --git a/chromium/v8/include/v8config.h b/chromium/v8/include/v8config.h
index 964949c24c3..69cf3b78c8b 100644
--- a/chromium/v8/include/v8config.h
+++ b/chromium/v8/include/v8config.h
@@ -61,6 +61,7 @@
 //  V8_OS_CYGWIN        - Cygwin
 //  V8_OS_DRAGONFLYBSD  - DragonFlyBSD
 //  V8_OS_FREEBSD       - FreeBSD
+//  V8_OS_FUCHSIA       - Fuchsia
 //  V8_OS_LINUX         - Linux
 //  V8_OS_MACOSX        - Mac OS X
 //  V8_OS_NETBSD        - NetBSD
@@ -95,6 +96,9 @@
 # define V8_OS_BSD 1
 # define V8_OS_FREEBSD 1
 # define V8_OS_POSIX 1
+#elif defined(__Fuchsia__)
+# define V8_OS_FUCHSIA 1
+# define V8_OS_POSIX 1
 #elif defined(__DragonFly__)
 # define V8_OS_BSD 1
 # define V8_OS_DRAGONFLYBSD 1
@@ -169,7 +173,6 @@
 //                                        supported
 //  V8_HAS_ATTRIBUTE_DEPRECATED         - __attribute__((deprecated)) supported
 //  V8_HAS_ATTRIBUTE_NOINLINE           - __attribute__((noinline)) supported
-//  V8_HAS_ATTRIBUTE_NORETURN           - __attribute__((noreturn)) supported
 //  V8_HAS_ATTRIBUTE_UNUSED             - __attribute__((unused)) supported
 //  V8_HAS_ATTRIBUTE_VISIBILITY         - __attribute__((visibility)) supported
 //  V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT - __attribute__((warn_unused_result))
@@ -209,7 +212,6 @@
 # define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (__has_attribute(always_inline))
 # define V8_HAS_ATTRIBUTE_DEPRECATED (__has_attribute(deprecated))
 # define V8_HAS_ATTRIBUTE_NOINLINE (__has_attribute(noinline))
-# define V8_HAS_ATTRIBUTE_NORETURN (__has_attribute(noreturn))
 # define V8_HAS_ATTRIBUTE_UNUSED (__has_attribute(unused))
 # define V8_HAS_ATTRIBUTE_VISIBILITY (__has_attribute(visibility))
 # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \
@@ -250,7 +252,6 @@
 # define V8_HAS_ATTRIBUTE_DEPRECATED (V8_GNUC_PREREQ(3, 4, 0))
 # define V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE (V8_GNUC_PREREQ(4, 5, 0))
 # define V8_HAS_ATTRIBUTE_NOINLINE (V8_GNUC_PREREQ(3, 4, 0))
-# define V8_HAS_ATTRIBUTE_NORETURN (V8_GNUC_PREREQ(2, 5, 0))
 # define V8_HAS_ATTRIBUTE_UNUSED (V8_GNUC_PREREQ(2, 95, 0))
 # define V8_HAS_ATTRIBUTE_VISIBILITY (V8_GNUC_PREREQ(4, 3, 0))
 # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \
@@ -311,18 +312,6 @@
 #endif
 
 
-// A macro used to tell the compiler that a particular function never returns.
-// Use like:
-//   V8_NORETURN void MyAbort() { abort(); }
-#if V8_HAS_ATTRIBUTE_NORETURN
-# define V8_NORETURN __attribute__((noreturn))
-#elif V8_HAS_DECLSPEC_NORETURN
-# define V8_NORETURN __declspec(noreturn)
-#else
-# define V8_NORETURN /* NOT SUPPORTED */
-#endif
-
-
 // A macro (V8_DEPRECATED) to mark classes or functions as deprecated.
 #if defined(V8_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE
 #define V8_DEPRECATED(message, declarator) \