Chrome tracing for system-wide performance stats.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 429da81500747d7355ae5e8ed989748e2d582bef..416d1168307ba23d1a2f3b6f61d9747fcae5c8af 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -20,6 +20,7 @@
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/system_monitor/system_monitor.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/timer/hi_res_timer_manager.h"
 #include "content/browser/browser_thread_impl.h"
@@ -495,6 +496,9 @@ void BrowserMainLoop::MainMessageLoopStart() {
       ::HeapProfilerStop,
       ::GetHeapProfile));
 #endif
+
+  system_stats_monitor_.reset(new base::debug::TraceEventSystemStatsMonitor(
+      base::ThreadTaskRunnerHandle::Get()));
 }
 
 int BrowserMainLoop::PreCreateThreads() {
@@ -715,6 +719,7 @@ void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
   }
 
   trace_memory_controller_.reset();
+  system_stats_monitor_.reset();
 
 #if !defined(OS_IOS)
   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to