BASELINE: Update Chromium to 75.0.3770.56

Change-Id: I86d2007fd27a45d5797eee06f4c9369b8b50ac4f
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

6 files changed, 188 insertions, 134 deletions

diff --git a/chromium/v8/include/v8-internal.h b/chromium/v8/include/v8-internal.h
index bb69bb915dd..8e700a4d4d4 100644
--- a/chromium/v8/include/v8-internal.h
+++ b/chromium/v8/include/v8-internal.h
@@ -7,6 +7,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <string.h>
 #include <type_traits>
 
 #include "v8-version.h"  // NOLINT(build/include)
@@ -29,7 +30,6 @@ static const Address kNullAddress = 0;
  * Configuration of tagging scheme.
  */
 const int kApiSystemPointerSize = sizeof(void*);
-const int kApiTaggedSize = kApiSystemPointerSize;
 const int kApiDoubleSize = sizeof(double);
 const int kApiInt32Size = sizeof(int32_t);
 const int kApiInt64Size = sizeof(int64_t);
@@ -92,6 +92,9 @@ struct SmiTagging<8> {
 static_assert(
     kApiSystemPointerSize == kApiInt64Size,
     "Pointer compression can be enabled only for 64-bit architectures");
+const int kApiTaggedSize = kApiInt32Size;
+#else
+const int kApiTaggedSize = kApiSystemPointerSize;
 #endif
 
 #ifdef V8_31BIT_SMIS_ON_64BIT_ARCH
@@ -131,11 +134,7 @@ class Internals {
   static const int kJSObjectHeaderSize = 3 * kApiTaggedSize;
   static const int kFixedArrayHeaderSize = 2 * kApiTaggedSize;
   static const int kEmbedderDataArrayHeaderSize = 2 * kApiTaggedSize;
-  static const int kEmbedderDataSlotSize =
-#ifdef V8_COMPRESS_POINTERS
-      2 *
-#endif
-      kApiSystemPointerSize;
+  static const int kEmbedderDataSlotSize = kApiSystemPointerSize;
   static const int kNativeContextEmbedderDataOffset = 7 * kApiTaggedSize;
   static const int kFullStringRepresentationMask = 0x0f;
   static const int kStringEncodingMask = 0x8;
@@ -166,7 +165,6 @@ class Internals {
   static const int kNodeStateMask = 0x7;
   static const int kNodeStateIsWeakValue = 2;
   static const int kNodeStateIsPendingValue = 3;
-  static const int kNodeStateIsNearDeathValue = 4;
   static const int kNodeIsIndependentShift = 3;
   static const int kNodeIsActiveShift = 4;
 
@@ -277,6 +275,17 @@ class Internals {
   V8_INLINE static T ReadRawField(internal::Address heap_object_ptr,
                                   int offset) {
     internal::Address addr = heap_object_ptr + offset - kHeapObjectTag;
+#ifdef V8_COMPRESS_POINTERS
+    if (sizeof(T) > kApiTaggedSize) {
+      // TODO(ishell, v8:8875): When pointer compression is enabled 8-byte size
+      // fields (external pointers, doubles and BigInt data) are only
+      // kTaggedSize aligned so we have to use unaligned pointer friendly way of
+      // accessing them in order to avoid undefined behavior in C++ code.
+      T r;
+      memcpy(&r, reinterpret_cast<void*>(addr), sizeof(T));
+      return r;
+    }
+#endif
     return *reinterpret_cast<const T*>(addr);
   }
 
@@ -301,22 +310,8 @@ class Internals {
 #endif
   }
 
-  V8_INLINE static internal::Address ReadTaggedAnyField(
-      internal::Address heap_object_ptr, int offset) {
-#ifdef V8_COMPRESS_POINTERS
-    int32_t value = ReadRawField<int32_t>(heap_object_ptr, offset);
-    internal::Address root_mask = static_cast<internal::Address>(
-        -static_cast<intptr_t>(value & kSmiTagMask));
-    internal::Address root_or_zero =
-        root_mask & GetRootFromOnHeapAddress(heap_object_ptr);
-    return root_or_zero +
-           static_cast<internal::Address>(static_cast<intptr_t>(value));
-#else
-    return ReadRawField<internal::Address>(heap_object_ptr, offset);
-#endif
-  }
-
 #ifdef V8_COMPRESS_POINTERS
+  // See v8:7703 or src/ptr-compr.* for details about pointer compression.
   static constexpr size_t kPtrComprHeapReservationSize = size_t{1} << 32;
   static constexpr size_t kPtrComprIsolateRootBias =
       kPtrComprHeapReservationSize / 2;
@@ -328,18 +323,14 @@ class Internals {
            -static_cast<intptr_t>(kPtrComprIsolateRootAlignment);
   }
 
-#else
-
-  template <typename T>
-  V8_INLINE static T ReadEmbedderData(const v8::Context* context, int index) {
-    typedef internal::Address A;
-    typedef internal::Internals I;
-    A ctx = *reinterpret_cast<const A*>(context);
-    A embedder_data =
-        I::ReadTaggedPointerField(ctx, I::kNativeContextEmbedderDataOffset);
-    int value_offset =
-        I::kEmbedderDataArrayHeaderSize + (I::kEmbedderDataSlotSize * index);
-    return I::ReadRawField<T>(embedder_data, value_offset);
+  V8_INLINE static internal::Address DecompressTaggedAnyField(
+      internal::Address heap_object_ptr, int32_t value) {
+    internal::Address root_mask = static_cast<internal::Address>(
+        -static_cast<intptr_t>(value & kSmiTagMask));
+    internal::Address root_or_zero =
+        root_mask & GetRootFromOnHeapAddress(heap_object_ptr);
+    return root_or_zero +
+           static_cast<internal::Address>(static_cast<intptr_t>(value));
   }
 #endif  // V8_COMPRESS_POINTERS
 };
diff --git a/chromium/v8/include/v8-profiler.h b/chromium/v8/include/v8-profiler.h
index 3adce79be56..672a694e079 100644
--- a/chromium/v8/include/v8-profiler.h
+++ b/chromium/v8/include/v8-profiler.h
@@ -48,7 +48,7 @@ template class V8_EXPORT std::vector<v8::CpuProfileDeoptInfo>;
 namespace v8 {
 
 // TickSample captures the information collected for each sample.
-struct TickSample {
+struct V8_EXPORT TickSample {
   // Internal profiling (with --prof + tools/$OS-tick-processor) wants to
   // include the runtime function we're calling. Externally exposed tick
   // samples don't care.
@@ -129,6 +129,20 @@ class V8_EXPORT CpuProfileNode {
     unsigned int hit_count;
   };
 
+  // An annotation hinting at the source of a CpuProfileNode.
+  enum SourceType {
+    // User-supplied script with associated resource information.
+    kScript = 0,
+    // Native scripts and provided builtins.
+    kBuiltin = 1,
+    // Callbacks into native code.
+    kCallback = 2,
+    // VM-internal functions or state.
+    kInternal = 3,
+    // A node that failed to symbolize.
+    kUnresolved = 4,
+  };
+
   /** Returns function name (empty string for anonymous functions.) */
   Local<String> GetFunctionName() const;
 
@@ -153,6 +167,12 @@ class V8_EXPORT CpuProfileNode {
   const char* GetScriptResourceNameStr() const;
 
   /**
+   * Return true if the script from where the function originates is flagged as
+   * being shared cross-origin.
+   */
+  bool IsScriptSharedCrossOrigin() const;
+
+  /**
    * Returns the number, 1-based, of the line where the function originates.
    * kNoLineNumberInfo if no line number information is available.
    */
@@ -194,12 +214,20 @@ class V8_EXPORT CpuProfileNode {
   /** Returns id of the node. The id is unique within the tree */
   unsigned GetNodeId() const;
 
+  /**
+   * Gets the type of the source which the node was captured from.
+   */
+  SourceType GetSourceType() const;
+
   /** Returns child nodes count of the node. */
   int GetChildrenCount() const;
 
   /** Retrieves a child node by index. */
   const CpuProfileNode* GetChild(int index) const;
 
+  /** Retrieves the ancestor node, or null if the root. */
+  const CpuProfileNode* GetParent() const;
+
   /** Retrieves deopt infos for the node. */
   const std::vector<CpuProfileDeoptInfo>& GetDeoptInfos() const;
 
@@ -302,6 +330,15 @@ class V8_EXPORT CpuProfiler {
   void SetSamplingInterval(int us);
 
   /**
+   * Sets whether or not the profiler should prioritize consistency of sample
+   * periodicity on Windows. Disabling this can greatly reduce CPU usage, but
+   * may result in greater variance in sample timings from the platform's
+   * scheduler. Defaults to enabled. This method must be called when there are
+   * no profiles being recorded.
+   */
+  void SetUsePreciseSampling(bool);
+
+  /**
    * Starts collecting CPU profile. Title may be an empty string. It
    * is allowed to have several profiles being collected at
    * once. Attempts to start collecting several profiles with the same
@@ -756,10 +793,6 @@ class V8_EXPORT HeapProfiler {
                                              v8::EmbedderGraph* graph,
                                              void* data);
 
-  /** TODO(addaleax): Remove */
-  typedef void (*LegacyBuildEmbedderGraphCallback)(v8::Isolate* isolate,
-                                                   v8::EmbedderGraph* graph);
-
   /** Returns the number of snapshots taken. */
   int GetSnapshotCount();
 
@@ -898,10 +931,6 @@ class V8_EXPORT HeapProfiler {
    */
   void DeleteAllHeapSnapshots();
 
-  V8_DEPRECATED(
-      "Use AddBuildEmbedderGraphCallback to provide info about embedder nodes",
-      void SetBuildEmbedderGraphCallback(
-          LegacyBuildEmbedderGraphCallback callback));
   void AddBuildEmbedderGraphCallback(BuildEmbedderGraphCallback callback,
                                      void* data);
   void RemoveBuildEmbedderGraphCallback(BuildEmbedderGraphCallback callback,
diff --git a/chromium/v8/include/v8-util.h b/chromium/v8/include/v8-util.h
index 466b99fd6b7..24962607076 100644
--- a/chromium/v8/include/v8-util.h
+++ b/chromium/v8/include/v8-util.h
@@ -198,7 +198,7 @@ class PersistentValueMapBase {
    * Call V8::RegisterExternallyReferencedObject with the map value for given
    * key.
    */
-  V8_DEPRECATE_SOON(
+  V8_DEPRECATED(
       "Used TracedGlobal and EmbedderHeapTracer::RegisterEmbedderReference",
       inline void RegisterExternallyReferencedObject(K& key));
 
diff --git a/chromium/v8/include/v8-version.h b/chromium/v8/include/v8-version.h
index a02ab4bb989..dfcd5b467db 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 7
-#define V8_MINOR_VERSION 4
+#define V8_MINOR_VERSION 5
 #define V8_BUILD_NUMBER 288
-#define V8_PATCH_LEVEL 28
+#define V8_PATCH_LEVEL 22
 
 // 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 6ecc48af332..b4b920555b2 100644
--- a/chromium/v8/include/v8.h
+++ b/chromium/v8/include/v8.h
@@ -118,6 +118,7 @@ class Arguments;
 class DeferredHandles;
 class Heap;
 class HeapObject;
+class ExternalString;
 class Isolate;
 class LocalEmbedderHeapTracer;
 class MicrotaskQueue;
@@ -549,7 +550,7 @@ template <class T> class PersistentBase {
    * is alive. Only allowed when the embedder is asked to trace its heap by
    * EmbedderHeapTracer.
    */
-  V8_DEPRECATE_SOON(
+  V8_DEPRECATED(
       "Used TracedGlobal and EmbedderHeapTracer::RegisterEmbedderReference",
       V8_INLINE void RegisterExternalReference(Isolate* isolate) const);
 
@@ -572,14 +573,10 @@ template <class T> class PersistentBase {
    *
    * This bit is cleared after the each garbage collection pass.
    */
-  V8_DEPRECATE_SOON("Use TracedGlobal.", V8_INLINE void MarkActive());
+  V8_DEPRECATED("Use TracedGlobal.", V8_INLINE void MarkActive());
 
   V8_DEPRECATED("See MarkIndependent.", V8_INLINE bool IsIndependent() const);
 
-  /** Checks if the handle holds the only reference to an object. */
-  V8_DEPRECATED("Garbage collection internal state should not be relied on.",
-                V8_INLINE bool IsNearDeath() const);
-
   /** Returns true if the handle's reference is weak.  */
   V8_INLINE bool IsWeak() const;
 
@@ -1535,7 +1532,12 @@ class V8_EXPORT ScriptCompiler {
    public:
     enum Encoding { ONE_BYTE, TWO_BYTE, UTF8 };
 
-    StreamedSource(ExternalSourceStream* source_stream, Encoding encoding);
+    V8_DEPRECATE_SOON(
+        "This class takes ownership of source_stream, so use the constructor "
+        "taking a unique_ptr to make these semantics clearer",
+        StreamedSource(ExternalSourceStream* source_stream, Encoding encoding));
+    StreamedSource(std::unique_ptr<ExternalSourceStream> source_stream,
+                   Encoding encoding);
     ~StreamedSource();
 
     internal::ScriptStreamingData* impl() const { return impl_.get(); }
@@ -2518,9 +2520,9 @@ class V8_EXPORT Value : public Data {
 
   V8_WARN_UNUSED_RESULT MaybeLocal<BigInt> ToBigInt(
       Local<Context> context) const;
-  V8_DEPRECATE_SOON("ToBoolean can never throw. Use Local version.",
-                    V8_WARN_UNUSED_RESULT MaybeLocal<Boolean> ToBoolean(
-                        Local<Context> context) const);
+  V8_DEPRECATED("ToBoolean can never throw. Use Local version.",
+                V8_WARN_UNUSED_RESULT MaybeLocal<Boolean> ToBoolean(
+                    Local<Context> context) const);
   V8_WARN_UNUSED_RESULT MaybeLocal<Number> ToNumber(
       Local<Context> context) const;
   V8_WARN_UNUSED_RESULT MaybeLocal<String> ToString(
@@ -2536,16 +2538,16 @@ class V8_EXPORT Value : public Data {
   V8_WARN_UNUSED_RESULT MaybeLocal<Int32> ToInt32(Local<Context> context) const;
 
   Local<Boolean> ToBoolean(Isolate* isolate) const;
-  V8_DEPRECATE_SOON("Use maybe version",
-                    Local<Number> ToNumber(Isolate* isolate) const);
-  V8_DEPRECATE_SOON("Use maybe version",
-                    Local<String> ToString(Isolate* isolate) const);
-  V8_DEPRECATE_SOON("Use maybe version",
-                    Local<Object> ToObject(Isolate* isolate) const);
-  V8_DEPRECATE_SOON("Use maybe version",
-                    Local<Integer> ToInteger(Isolate* isolate) const);
-  V8_DEPRECATE_SOON("Use maybe version",
-                    Local<Int32> ToInt32(Isolate* isolate) const);
+  V8_DEPRECATED("Use maybe version",
+                Local<Number> ToNumber(Isolate* isolate) const);
+  V8_DEPRECATED("Use maybe version",
+                Local<String> ToString(Isolate* isolate) const);
+  V8_DEPRECATED("Use maybe version",
+                Local<Object> ToObject(Isolate* isolate) const);
+  V8_DEPRECATED("Use maybe version",
+                Local<Integer> ToInteger(Isolate* isolate) const);
+  V8_DEPRECATED("Use maybe version",
+                Local<Int32> ToInt32(Isolate* isolate) const);
 
   /**
    * Attempts to convert a string to an array index.
@@ -2796,7 +2798,7 @@ class V8_EXPORT String : public Name {
     void operator=(const ExternalStringResourceBase&) = delete;
 
    private:
-    friend class internal::Heap;
+    friend class internal::ExternalString;
     friend class v8::String;
     friend class internal::ScopedExternalStringLock;
   };
@@ -2904,7 +2906,7 @@ class V8_EXPORT String : public Name {
       int length = -1);
 
   /** Allocates a new string from UTF-16 data.*/
-  static V8_DEPRECATE_SOON(
+  static V8_DEPRECATED(
       "Use maybe version",
       Local<String> NewFromTwoByte(Isolate* isolate, const uint16_t* data,
                                    NewStringType type = kNormalString,
@@ -2953,7 +2955,7 @@ class V8_EXPORT String : public Name {
    * should the underlying buffer be deallocated or modified except through the
    * destructor of the external string resource.
    */
-  static V8_DEPRECATE_SOON(
+  static V8_DEPRECATED(
       "Use maybe version",
       Local<String> NewExternal(Isolate* isolate,
                                 ExternalOneByteStringResource* resource));
@@ -4527,9 +4529,6 @@ class V8_EXPORT WasmModuleObject : public Object {
   static void CheckCast(Value* obj);
 };
 
-V8_DEPRECATED("Use WasmModuleObject",
-              typedef WasmModuleObject WasmCompiledModule);
-
 /**
  * The V8 interface for WebAssembly streaming compilation. When streaming
  * compilation is initiated, V8 passes a {WasmStreaming} object to the embedder
@@ -5165,8 +5164,7 @@ class V8_EXPORT SharedArrayBuffer : public Object {
           allocation_length_(0),
           allocation_mode_(Allocator::AllocationMode::kNormal),
           deleter_(nullptr),
-          deleter_data_(nullptr),
-          is_growable_(false) {}
+          deleter_data_(nullptr) {}
 
     void* AllocationBase() const { return allocation_base_; }
     size_t AllocationLength() const { return allocation_length_; }
@@ -5178,13 +5176,12 @@ class V8_EXPORT SharedArrayBuffer : public Object {
     size_t ByteLength() const { return byte_length_; }
     DeleterCallback Deleter() const { return deleter_; }
     void* DeleterData() const { return deleter_data_; }
-    bool IsGrowable() const { return is_growable_; }
 
    private:
     Contents(void* data, size_t byte_length, void* allocation_base,
              size_t allocation_length,
              Allocator::AllocationMode allocation_mode, DeleterCallback deleter,
-             void* deleter_data, bool is_growable);
+             void* deleter_data);
 
     void* data_;
     size_t byte_length_;
@@ -5193,7 +5190,6 @@ class V8_EXPORT SharedArrayBuffer : public Object {
     Allocator::AllocationMode allocation_mode_;
     DeleterCallback deleter_;
     void* deleter_data_;
-    bool is_growable_;
 
     friend class SharedArrayBuffer;
   };
@@ -5225,9 +5221,11 @@ class V8_EXPORT SharedArrayBuffer : public Object {
    * Create a new SharedArrayBuffer over an existing memory block. Propagate
    * flags to indicate whether the underlying buffer can be grown.
    */
-  static Local<SharedArrayBuffer> New(
-      Isolate* isolate, const SharedArrayBuffer::Contents&,
-      ArrayBufferCreationMode mode = ArrayBufferCreationMode::kExternalized);
+  V8_DEPRECATED("Use New method with data, and byte_length instead.",
+                static Local<SharedArrayBuffer> New(
+                    Isolate* isolate, const SharedArrayBuffer::Contents&,
+                    ArrayBufferCreationMode mode =
+                        ArrayBufferCreationMode::kExternalized));
 
   /**
    * Returns true if SharedArrayBuffer is externalized, that is, does not
@@ -5316,11 +5314,10 @@ class V8_EXPORT Date : public Object {
    * This API should not be called more than needed as it will
    * negatively impact the performance of date operations.
    */
-  V8_DEPRECATE_SOON(
-      "Use Isolate::DateTimeConfigurationChangeNotification",
-      static void DateTimeConfigurationChangeNotification(
-          Isolate* isolate,
-          TimeZoneDetection time_zone_detection = TimeZoneDetection::kSkip));
+  V8_DEPRECATED("Use Isolate::DateTimeConfigurationChangeNotification",
+                static void DateTimeConfigurationChangeNotification(
+                    Isolate* isolate, TimeZoneDetection time_zone_detection =
+                                          TimeZoneDetection::kSkip));
 
  private:
   static void CheckCast(Value* obj);
@@ -6500,10 +6497,6 @@ class V8_EXPORT Extension {  // NOLINT
   bool auto_enable_;
 };
 
-V8_DEPRECATED(
-    "Use unique_ptr version or stop using extension (http://crbug.com/334679).",
-    void V8_EXPORT RegisterExtension(Extension* extension));
-
 void V8_EXPORT RegisterExtension(std::unique_ptr<Extension>);
 
 // --- Statics ---
@@ -6686,7 +6679,7 @@ typedef void (*HostInitializeImportMetaObjectCallback)(Local<Context> context,
  * first accessed. The return value will be used as the stack value. If this
  * callback is registed, the |Error.prepareStackTrace| API will be disabled.
  * |sites| is an array of call sites, specified in
- * https://github.com/v8/v8/wiki/Stack-Trace-API
+ * https://v8.dev/docs/stack-trace-api
  */
 typedef MaybeLocal<Value> (*PrepareStackTraceCallback)(Local<Context> context,
                                                        Local<Value> error,
@@ -6724,11 +6717,8 @@ enum PromiseRejectEvent {
 class PromiseRejectMessage {
  public:
   PromiseRejectMessage(Local<Promise> promise, PromiseRejectEvent event,
-                       Local<Value> value, Local<StackTrace> stack_trace)
-      : promise_(promise),
-        event_(event),
-        value_(value),
-        stack_trace_(stack_trace) {}
+                       Local<Value> value)
+      : promise_(promise), event_(event), value_(value) {}
 
   V8_INLINE Local<Promise> GetPromise() const { return promise_; }
   V8_INLINE PromiseRejectEvent GetEvent() const { return event_; }
@@ -6738,13 +6728,13 @@ class PromiseRejectMessage {
   Local<Promise> promise_;
   PromiseRejectEvent event_;
   Local<Value> value_;
-  Local<StackTrace> stack_trace_;
 };
 
 typedef void (*PromiseRejectCallback)(PromiseRejectMessage message);
 
 // --- Microtasks Callbacks ---
-typedef void (*MicrotasksCompletedCallback)(Isolate*);
+V8_DEPRECATE_SOON("Use *WithData version.",
+                  typedef void (*MicrotasksCompletedCallback)(Isolate*));
 typedef void (*MicrotasksCompletedCallbackWithData)(Isolate*, void*);
 typedef void (*MicrotaskCallback)(void* data);
 
@@ -6778,7 +6768,8 @@ class V8_EXPORT MicrotaskQueue {
   /**
    * Creates an empty MicrotaskQueue instance.
    */
-  static std::unique_ptr<MicrotaskQueue> New();
+  static std::unique_ptr<MicrotaskQueue> New(
+      Isolate* isolate, MicrotasksPolicy policy = MicrotasksPolicy::kAuto);
 
   virtual ~MicrotaskQueue() = default;
 
@@ -6826,6 +6817,12 @@ class V8_EXPORT MicrotaskQueue {
    */
   virtual bool IsRunningMicrotasks() const = 0;
 
+  /**
+   * Returns the current depth of nested MicrotasksScope that has
+   * kRunMicrotasks.
+   */
+  virtual int GetMicrotasksScopeDepth() const = 0;
+
  private:
   friend class internal::MicrotaskQueue;
   MicrotaskQueue() = default;
@@ -7174,6 +7171,13 @@ enum JitCodeEventOptions {
  */
 typedef void (*JitCodeEventHandler)(const JitCodeEvent* event);
 
+/**
+ * Callback function passed to SetUnhandledExceptionCallback.
+ */
+#if defined(V8_OS_WIN)
+typedef int (*UnhandledExceptionCallback)(
+    _EXCEPTION_POINTERS* exception_pointers);
+#endif
 
 /**
  * Interface for iterating through all external resources in the heap.
@@ -8231,12 +8235,20 @@ class V8_EXPORT Isolate {
    * Executing scripts inside the callback will not re-trigger microtasks and
    * the callback.
    */
-  void AddMicrotasksCompletedCallback(MicrotasksCompletedCallback callback);
+  V8_DEPRECATE_SOON("Use *WithData version.",
+                    void AddMicrotasksCompletedCallback(
+                        MicrotasksCompletedCallback callback));
+  void AddMicrotasksCompletedCallback(
+      MicrotasksCompletedCallbackWithData callback, void* data = nullptr);
 
   /**
    * Removes callback that was installed by AddMicrotasksCompletedCallback.
    */
-  void RemoveMicrotasksCompletedCallback(MicrotasksCompletedCallback callback);
+  V8_DEPRECATE_SOON("Use *WithData version.",
+                    void RemoveMicrotasksCompletedCallback(
+                        MicrotasksCompletedCallback callback));
+  void RemoveMicrotasksCompletedCallback(
+      MicrotasksCompletedCallbackWithData callback, void* data = nullptr);
 
   /**
    * Sets a callback for counting the number of times a feature of V8 is used.
@@ -8380,13 +8392,13 @@ class V8_EXPORT Isolate {
   /**
    * Returns a memory range that can potentially contain jitted code. Code for
    * V8's 'builtins' will not be in this range if embedded builtins is enabled.
-   * Instead, see GetEmbeddedCodeRange.
    *
    * On Win64, embedders are advised to install function table callbacks for
    * these ranges, as default SEH won't be able to unwind through jitted code.
-   *
    * The first page of the code range is reserved for the embedder and is
-   * committed, writable, and executable.
+   * committed, writable, and executable, to be used to store unwind data, as
+   * documented in
+   * https://docs.microsoft.com/en-us/cpp/build/exception-handling-x64.
    *
    * Might be empty on other platforms.
    *
@@ -8519,17 +8531,6 @@ class V8_EXPORT Isolate {
 
   /**
    * Iterates through all the persistent handles in the current isolate's heap
-   * that have class_ids and are candidates to be marked as partially dependent
-   * handles. This will visit handles to young objects created since the last
-   * garbage collection but is free to visit an arbitrary superset of these
-   * objects.
-   */
-  V8_DEPRECATED(
-      "Use VisitHandlesWithClassIds",
-      void VisitHandlesForPartialDependence(PersistentHandleVisitor* visitor));
-
-  /**
-   * Iterates through all the persistent handles in the current isolate's heap
    * that have class_ids and are weak to be marked as inactive if there is no
    * pending activity for the handle.
    */
@@ -8797,6 +8798,20 @@ class V8_EXPORT V8 {
    */
   static bool EnableWebAssemblyTrapHandler(bool use_v8_signal_handler);
 
+#if defined(V8_OS_WIN)
+  /**
+   * On Win64, by default V8 does not emit unwinding data for jitted code,
+   * which means the OS cannot walk the stack frames and the system Structured
+   * Exception Handling (SEH) cannot unwind through V8-generated code:
+   * https://code.google.com/p/v8/issues/detail?id=3598.
+   *
+   * This function allows embedders to register a custom exception handler for
+   * exceptions in V8-generated code.
+   */
+  static void SetUnhandledExceptionCallback(
+      UnhandledExceptionCallback unhandled_exception_callback);
+#endif
+
  private:
   V8();
 
@@ -9782,17 +9797,6 @@ bool PersistentBase<T>::IsIndependent() const {
 }
 
 template <class T>
-bool PersistentBase<T>::IsNearDeath() const {
-  typedef internal::Internals I;
-  if (this->IsEmpty()) return false;
-  uint8_t node_state =
-      I::GetNodeState(reinterpret_cast<internal::Address*>(this->val_));
-  return node_state == I::kNodeStateIsNearDeathValue ||
-      node_state == I::kNodeStateIsPendingValue;
-}
-
-
-template <class T>
 bool PersistentBase<T>::IsWeak() const {
   typedef internal::Internals I;
   if (this->IsEmpty()) return false;
@@ -10313,7 +10317,7 @@ AccessorSignature* AccessorSignature::Cast(Data* data) {
 }
 
 Local<Value> Object::GetInternalField(int index) {
-#if !defined(V8_ENABLE_CHECKS) && !defined(V8_COMPRESS_POINTERS)
+#ifndef V8_ENABLE_CHECKS
   typedef internal::Address A;
   typedef internal::Internals I;
   A obj = *reinterpret_cast<A*>(this);
@@ -10324,7 +10328,12 @@ Local<Value> Object::GetInternalField(int index) {
       instance_type == I::kJSApiObjectType ||
       instance_type == I::kJSSpecialApiObjectType) {
     int offset = I::kJSObjectHeaderSize + (I::kEmbedderDataSlotSize * index);
-    A value = I::ReadTaggedAnyField(obj, offset);
+    A value = I::ReadRawField<A>(obj, offset);
+#ifdef V8_COMPRESS_POINTERS
+    // We read the full pointer value and then decompress it in order to avoid
+    // dealing with potential endiannes issues.
+    value = I::DecompressTaggedAnyField(obj, static_cast<int32_t>(value));
+#endif
     internal::Isolate* isolate =
         internal::IsolateFromNeverReadOnlySpaceObject(obj);
     A* result = HandleScope::CreateHandle(isolate, value);
@@ -10336,7 +10345,7 @@ Local<Value> Object::GetInternalField(int index) {
 
 
 void* Object::GetAlignedPointerFromInternalField(int index) {
-#if !defined(V8_ENABLE_CHECKS) && !defined(V8_COMPRESS_POINTERS)
+#ifndef V8_ENABLE_CHECKS
   typedef internal::Address A;
   typedef internal::Internals I;
   A obj = *reinterpret_cast<A*>(this);
@@ -10925,7 +10934,11 @@ int64_t Isolate::AdjustAmountOfExternalAllocatedMemory(
       reinterpret_cast<int64_t*>(reinterpret_cast<uint8_t*>(this) +
                                  I::kExternalMemoryAtLastMarkCompactOffset);
 
-  const int64_t amount = *external_memory + change_in_bytes;
+  // Embedders are weird: we see both over- and underflows here. Perform the
+  // addition with unsigned types to avoid undefined behavior.
+  const int64_t amount =
+      static_cast<int64_t>(static_cast<uint64_t>(change_in_bytes) +
+                           static_cast<uint64_t>(*external_memory));
   *external_memory = amount;
 
   int64_t allocation_diff_since_last_mc =
@@ -10947,13 +10960,24 @@ int64_t Isolate::AdjustAmountOfExternalAllocatedMemory(
 }
 
 Local<Value> Context::GetEmbedderData(int index) {
-#if !defined(V8_ENABLE_CHECKS) && !defined(V8_COMPRESS_POINTERS)
+#ifndef V8_ENABLE_CHECKS
   typedef internal::Address A;
   typedef internal::Internals I;
+  A ctx = *reinterpret_cast<const A*>(this);
+  A embedder_data =
+      I::ReadTaggedPointerField(ctx, I::kNativeContextEmbedderDataOffset);
+  int value_offset =
+      I::kEmbedderDataArrayHeaderSize + (I::kEmbedderDataSlotSize * index);
+  A value = I::ReadRawField<A>(embedder_data, value_offset);
+#ifdef V8_COMPRESS_POINTERS
+  // We read the full pointer value and then decompress it in order to avoid
+  // dealing with potential endiannes issues.
+  value =
+      I::DecompressTaggedAnyField(embedder_data, static_cast<int32_t>(value));
+#endif
   internal::Isolate* isolate = internal::IsolateFromNeverReadOnlySpaceObject(
       *reinterpret_cast<A*>(this));
-  A* result =
-      HandleScope::CreateHandle(isolate, I::ReadEmbedderData<A>(this, index));
+  A* result = HandleScope::CreateHandle(isolate, value);
   return Local<Value>(reinterpret_cast<Value*>(result));
 #else
   return SlowGetEmbedderData(index);
@@ -10962,9 +10986,15 @@ Local<Value> Context::GetEmbedderData(int index) {
 
 
 void* Context::GetAlignedPointerFromEmbedderData(int index) {
-#if !defined(V8_ENABLE_CHECKS) && !defined(V8_COMPRESS_POINTERS)
+#ifndef V8_ENABLE_CHECKS
+  typedef internal::Address A;
   typedef internal::Internals I;
-  return I::ReadEmbedderData<void*>(this, index);
+  A ctx = *reinterpret_cast<const A*>(this);
+  A embedder_data =
+      I::ReadTaggedPointerField(ctx, I::kNativeContextEmbedderDataOffset);
+  int value_offset =
+      I::kEmbedderDataArrayHeaderSize + (I::kEmbedderDataSlotSize * index);
+  return I::ReadRawField<void*>(embedder_data, value_offset);
 #else
   return SlowGetAlignedPointerFromEmbedderData(index);
 #endif
diff --git a/chromium/v8/include/v8config.h b/chromium/v8/include/v8config.h
index e30a582e8f2..5ec0480cf5c 100644
--- a/chromium/v8/include/v8config.h
+++ b/chromium/v8/include/v8config.h
@@ -64,6 +64,7 @@
 //  V8_OS_FUCHSIA       - Fuchsia
 //  V8_OS_LINUX         - Linux
 //  V8_OS_MACOSX        - Mac OS X
+//  V8_OS_IOS           - iOS
 //  V8_OS_NETBSD        - NetBSD
 //  V8_OS_OPENBSD       - OpenBSD
 //  V8_OS_POSIX         - POSIX compatible (mostly everything except Windows)
@@ -80,6 +81,9 @@
 # define V8_OS_BSD 1
 # define V8_OS_MACOSX 1
 # define V8_OS_POSIX 1
+# if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
+#  define V8_OS_IOS 1
+# endif  // defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
 #elif defined(__CYGWIN__)
 # define V8_OS_CYGWIN 1
 # define V8_OS_POSIX 1