Temporary commit to evaluate perf impact of prototype CPU profiler

chrome/browser/chrome_browser_main.h

Index: chrome/browser/chrome_browser_main.h
diff --git a/chrome/browser/chrome_browser_main.h b/chrome/browser/chrome_browser_main.h
index 65cbaa378ad7ad5f601582859a2d3cd3eb1d1ec8..c3e7d53bf8c81e725c8c55ef4cb2d4e7fc0e6d01 100644
--- a/chrome/browser/chrome_browser_main.h
+++ b/chrome/browser/chrome_browser_main.h
@@ -8,6 +8,7 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
+#include "base/profiler/cpu_profiler.h"
 #include "base/tracked_objects.h"
 #include "chrome/browser/chrome_browser_field_trials.h"
 #include "chrome/browser/chrome_process_singleton.h"
@@ -151,6 +152,9 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
   // Parts are deleted in the inverse order they are added.
   std::vector<ChromeBrowserMainExtraParts*> chrome_extra_parts_;
 
+  // A profiler that periodically samples stack traces.
+  base::CpuProfiler cpu_profiler_;
+
   // Members initialized after / released before main_message_loop_ ------------
 
   scoped_ptr<BrowserProcessImpl> browser_process_;