Add Startup Timing to CPM

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 00c05d098141af22013e9cc3cf5c863e4e0813f3..56a40222dbbb18fe24f5806cfd79b87b0c8ce0ca 100644
--- a/chrome/browser/chrome_browser_main.h
+++ b/chrome/browser/chrome_browser_main.h
@@ -43,6 +43,10 @@ namespace content {
 struct MainFunctionParams;
 }
 
+namespace performance_monitor {
+class StartupTimer;
+}
+
 class ChromeBrowserMainParts : public content::BrowserMainParts {
  public:
   virtual ~ChromeBrowserMainParts();
@@ -177,6 +181,11 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
   // it is destroyed last.
   scoped_ptr<ShutdownWatcherHelper> shutdown_watcher_;
 
+  // A timer to hold data regarding startup and session restore times for
+  // PerformanceMonitor so that we don't have to start the entire
+  // PerformanceMonitor at browser startup.
+  scoped_ptr<performance_monitor::StartupTimer> startup_timer_;
+
   // Creating this object starts tracking the creation and deletion of Task
   // instance. This MUST be done before main_message_loop, so that it is
   // destroyed after the main_message_loop.