Record Chrome trace events in tcmalloc heap profiles

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index 30442a674d919de9d99609777e23f46470368527..b64ba131043c6a7d1af0ecbe66ff65f8edcf3c3d 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -16,6 +16,9 @@ namespace base {
 class MessageLoop;
 class PowerMonitor;
 class SystemMonitor;
+namespace debug {
+class TraceMemoryTraceLogObserver;
+}
 }
 
 namespace media {
@@ -135,6 +138,7 @@ class BrowserMainLoop {
   scoped_ptr<BrowserProcessSubThread> cache_thread_;
   scoped_ptr<BrowserProcessSubThread> io_thread_;
   scoped_ptr<MemoryObserver> memory_observer_;
+  scoped_ptr<base::debug::TraceMemoryTraceLogObserver> trace_memory_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserMainLoop);
 };