(WIP) Implement V8 Tracing -- DO NOT LAND

gin/isolate_holder.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gin/public/isolate_holder.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/rand_util.h"
 #include "base/sys_info.h"
 #include "gin/array_buffer.h"
 #include "gin/debug_impl.h"
+#include "gin/event_tracer_impl.h"
 #include "gin/function_template.h"
 #include "gin/per_isolate_data.h"
 #include "gin/public/v8_platform.h"
 #include "gin/run_microtasks_observer.h"
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 #include "base/files/memory_mapped_file.h"
 #include "base/path_service.h"
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 
@@ skipping 136 matching lines @@
   natives.compressed_size = g_mapped_natives->length();
   v8::V8::SetNativesDataBlob(&natives);
 
   v8::StartupData snapshot;
   snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
   snapshot.raw_size = g_mapped_snapshot->length();
   snapshot.compressed_size = g_mapped_snapshot->length();
   v8::V8::SetSnapshotDataBlob(&snapshot);
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
   v8::V8::Initialize();
+  InitV8EventTracer();
   v8_is_initialized = true;
 }
 
 void IsolateHolder::AddRunMicrotasksObserver() {
   DCHECK(!task_observer_.get());
   task_observer_.reset(new RunMicrotasksObserver(isolate_));;
   base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
 }
 
 void IsolateHolder::RemoveRunMicrotasksObserver() {
   DCHECK(task_observer_.get());
   base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
   task_observer_.reset();
 }
 
 }  // namespace gin