Add V8 heap statistics in a time-line manner in tracing.

content/content_renderer.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     'content_common_mojo_bindings',
     '../base/base.gyp:base',
     '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
     '../cc/cc.gyp:cc',
@@ skipping 52 matching lines @@
       'public/renderer/render_process_observer.cc',
       'public/renderer/render_process_observer.h',
       'public/renderer/render_thread.cc',
       'public/renderer/render_thread.h',
       'public/renderer/render_view.h',
       'public/renderer/render_view_observer.cc',
       'public/renderer/render_view_observer.h',
       'public/renderer/render_view_observer_tracker.h',
       'public/renderer/render_view_visitor.h',
       'public/renderer/resource_fetcher.h',
+      'public/renderer/v8_heap_statistics_collector.h',
       'public/renderer/v8_value_converter.h',
       'public/renderer/video_encode_accelerator.cc',
       'public/renderer/video_encode_accelerator.h',
       'public/renderer/web_preferences.h',
     ],
     'private_renderer_sources': [
       'renderer/accessibility/blink_ax_enum_conversion.cc',
       'renderer/accessibility/blink_ax_enum_conversion.h',
       'renderer/accessibility/blink_ax_tree_source.cc',
       'renderer/accessibility/blink_ax_tree_source.h',
@@ skipping 362 matching lines @@
       'renderer/skia_benchmarking_extension.cc',
       'renderer/skia_benchmarking_extension.h',
       'renderer/speech_recognition_dispatcher.cc',
       'renderer/speech_recognition_dispatcher.h',
       'renderer/stats_collection_controller.cc',
       'renderer/stats_collection_controller.h',
       'renderer/stats_collection_observer.cc',
       'renderer/stats_collection_observer.h',
       'renderer/text_input_client_observer.cc',
       'renderer/text_input_client_observer.h',
+      'renderer/v8_heap_statistics_collector_impl.cc',
+      'renderer/v8_heap_statistics_collector_impl.h',
+      'renderer/v8_heap_statistics_monitor.cc',
+      'renderer/v8_heap_statistics_monitor.h',
       'renderer/v8_value_converter_impl.cc',
       'renderer/v8_value_converter_impl.h',
       'renderer/web_preferences.cc',
       'renderer/web_ui_extension.cc',
       'renderer/web_ui_extension.h',
       'renderer/web_ui_extension_data.cc',
       'renderer/web_ui_extension_data.h',
       'renderer/web_ui_mojo.cc',
       'renderer/web_ui_mojo.h',
       'renderer/web_ui_mojo_context_state.cc',
@@ skipping 408 matching lines @@
     }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }