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 5c3608bc8726bf5abce42176d91435765fcd2c2c..55d8bdcc23eb131979184e5ef94b7edcb5bcca25 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -18,6 +18,7 @@ class PowerMonitor;
 class SystemMonitor;
 namespace debug {
 class TraceMemoryController;
+class TraceSystemController;
 }  // namespace debug
 }  // namespace base
 
@@ -146,6 +147,7 @@ class CONTENT_EXPORT BrowserMainLoop {
   scoped_ptr<base::Thread> indexed_db_thread_;
   scoped_ptr<MemoryObserver> memory_observer_;
   scoped_ptr<base::debug::TraceMemoryController> trace_memory_controller_;
+  scoped_ptr<base::debug::TraceSystemController> trace_system_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserMainLoop);
 };