deps: cherry-pick 814577e from upstream V8

Original commit message:

    [tracing] allow embedders to provide own tracing timestamps

    Make it possible for embedders to provide their own tracing timetamps by
    providing an overridable virtual function on V8's tracing controller.

    Bug:
    Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
    Change-Id: I727e633cb7f63d4b41c2e427ecca3c9174c90bfe
    Reviewed-on: https://chromium-review.googlesource.com/847690
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Fadi Meawad <fmeawad@chromium.org>
    Commit-Queue: Ali Ijaz Sheikh <ofrobots@google.com>
    Cr-Commit-Position: refs/heads/master@{#50489}

Refs: https://github.com/v8/v8/commit/814577e3fd097ef772fd6d92a1ad3abd934506e6
Refs: https://github.com/nodejs/node/issues/17349
PR-URL: https://github.com/nodejs/node/pull/18196
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/deps/v8/include/libplatform/v8-tracing.h b/deps/v8/include/libplatform/v8-tracing.h
index 8c1febf762..55189b4837 100644
--- a/deps/v8/include/libplatform/v8-tracing.h
+++ b/deps/v8/include/libplatform/v8-tracing.h
@@ -43,8 +43,8 @@ class V8_PLATFORM_EXPORT TraceObject {
       const char** arg_names, const uint8_t* arg_types,
       const uint64_t* arg_values,
       std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables,
-      unsigned int flags);
-  void UpdateDuration();
+      unsigned int flags, int64_t timestamp, int64_t cpu_timestamp);
+  void UpdateDuration(int64_t timestamp, int64_t cpu_timestamp);
   void InitializeForTesting(
       char phase, const uint8_t* category_enabled_flag, const char* name,
       const char* scope, uint64_t id, uint64_t bind_id, int num_args,
@@ -259,6 +259,10 @@ class V8_PLATFORM_EXPORT TracingController
 
   static const char* GetCategoryGroupName(const uint8_t* category_enabled_flag);
 
+ protected:
+  virtual int64_t CurrentTimestampMicroseconds();
+  virtual int64_t CurrentCpuTimestampMicroseconds();
+
  private:
   const uint8_t* GetCategoryGroupEnabledInternal(const char* category_group);
   void UpdateCategoryGroupEnabledFlag(size_t category_index);