Record Chrome trace events in tcmalloc heap profiles

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 6d0f883e09a7ad3f06adc16735e6d602d7a150c6..a5430e3d8e3572a308be153b7f26abeb433f1649 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -402,6 +402,8 @@ void RenderThreadImpl::Init() {
 #if defined(USE_TCMALLOC) && (defined(OS_LINUX) || defined(OS_ANDROID))
   if (command_line.HasSwitch(switches::kEnableMemoryBenchmarking))
     RegisterExtension(MemoryBenchmarkingExtension::Get());
+  trace_memory_observer_.reset(new base::debug::TraceMemoryTraceLogObserver(
+      GetMessageLoop()->message_loop_proxy()));
 #endif  // USE_TCMALLOC
 
   if (command_line.HasSwitch(switches::kEnableSkiaBenchmarking)) {
@@ -438,6 +440,10 @@ void RenderThreadImpl::Shutdown() {
     devtools_agent_message_filter_ = NULL;
   }
 
+#if defined(USE_TCMALLOC) && (defined(OS_LINUX) || defined(OS_ANDROID))
+  trace_memory_observer_.reset();
+#endif
+
   RemoveFilter(audio_input_message_filter_.get());
   audio_input_message_filter_ = NULL;