Add Startup Timing to CPM

chrome/browser/chrome_browser_main.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROME_BROWSER_MAIN_H_
 #define CHROME_BROWSER_CHROME_BROWSER_MAIN_H_
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 25 matching lines @@
 }
 
 namespace chrome_browser_metrics {
 class TrackingSynchronizer;
 }
 
 namespace content {
 struct MainFunctionParams;
 }
 
+namespace performance_monitor {
+class StartupTimer;
+}
+
 class ChromeBrowserMainParts : public content::BrowserMainParts {
  public:
   virtual ~ChromeBrowserMainParts();
 
   // Add additional ChromeBrowserMainExtraParts.
   virtual void AddParts(ChromeBrowserMainExtraParts* parts);
 
  protected:
   explicit ChromeBrowserMainParts(
       const content::MainFunctionParams& parameters);
@@ skipping 114 matching lines @@
   int result_code_;
 
   // Create StartupTimeBomb object for watching jank during startup.
   scoped_ptr<StartupTimeBomb> startup_watcher_;
 
   // Create ShutdownWatcherHelper object for watching jank during shutdown.
   // Please keep |shutdown_watcher| as the first object constructed, and hence
   // 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.
   task_profiler::AutoTracking tracking_objects_;
 
   // Statistical testing infrastructure for the entire browser. NULL until
   // SetupMetricsAndFieldTrials is called.
   scoped_ptr<base::FieldTrialList> field_trial_list_;
 
   // Vector of additional ChromeBrowserMainExtraParts.
@@ skipping 52 matching lines @@
 // Records the time from our process' startup to the present time in
 // the Startup.BrowserMessageLoopStartTime UMA histogram.
 void RecordBrowserStartupTime();
 
 // Records a time value to an UMA histogram in the context of the
 // PreReadExperiment field-trial. This also reports to the appropriate
 // sub-histogram (_PreRead(Enabled|Disabled)).
 void RecordPreReadExperimentTime(const char* name, base::TimeDelta time);
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_H_