Chrome tracing for system-wide performance stats.

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 b3ec73c8490e23b1f5dbcaed03d3da80cc65173a..821da8727553536aa5fb45abc8ec66f595057d56 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -20,6 +20,7 @@ class PowerMonitor;
 class SystemMonitor;
 namespace debug {
 class TraceMemoryController;
+class TraceEventSystemStatsMonitor;
 }  // namespace debug
 }  // namespace base
 
@@ -170,6 +171,7 @@ 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::TraceEventSystemStatsMonitor> system_stats_monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserMainLoop);
 };