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

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 73ab00862d967b0b3e2574d512c08cb8397fe76c..e471bdc213a67a5e54da4c08b4660c261217ae9c 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -49,6 +49,7 @@
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/renderer_webkitplatformsupport_impl.h"
 #include "content/renderer/resizing_mode_selector.h"
+#include "content/renderer/v8_heap_statistics_monitor.h"
 #include "ipc/ipc_sync_message.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
@@ -1208,6 +1209,12 @@ void RenderWidget::didBecomeReadyForAdditionalInput() {
 void RenderWidget::DidCommitCompositorFrame() {
   FOR_EACH_OBSERVER(RenderFrameProxy, render_frame_proxies_,
                     DidCommitCompositorFrame());
+
+  V8HeapStatisticsMonitor* monitor =
+      RenderThreadImpl::current()->v8_heap_statistics_monitor();
+  if (monitor->IsMonitoring())
+    monitor->BeginAnotherDump();
+
 #if defined(VIDEO_HOLE)
   FOR_EACH_OBSERVER(RenderFrameImpl, video_hole_frames_,
                     DidCommitCompositorFrame());