Log operator code histogram on new metric log

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/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
 #include "base/tracked_objects.h"
 #include "chrome/browser/chrome_browser_field_trials.h"
 #include "chrome/browser/chrome_process_singleton.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/process_singleton.h"
 #include "chrome/browser/task_profiler/auto_tracking.h"
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "content/public/common/main_function_params.h"
 
 class BrowserProcessImpl;
 class ChromeBrowserMainExtraParts;
+class ChromeBrowserMetricsLogObserver;
 class FieldTrialSynchronizer;
 class MetricsService;
 class PrefService;
 class Profile;
 class StartupBrowserCreator;
 class StartupTimeBomb;
 class ShutdownWatcherHelper;
 class ThreeDAPIObserver;
 
 namespace chrome_browser {
@@ skipping 111 matching lines @@
 
   // 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_;
 
+  // Observe and log histograms on new metric logs.
+  scoped_ptr<ChromeBrowserMetricsLogObserver> browser_metrics_log_observer_;
+
   ChromeBrowserFieldTrials browser_field_trials_;
 
   // Vector of additional ChromeBrowserMainExtraParts.
   // Parts are deleted in the inverse order they are added.
   std::vector<ChromeBrowserMainExtraParts*> chrome_extra_parts_;
 
   // Members initialized after / released before main_message_loop_ ------------
 
   scoped_ptr<BrowserProcessImpl> browser_process_;
   scoped_refptr<chrome_browser_metrics::TrackingSynchronizer>
@@ skipping 26 matching lines @@
   bool restart_last_session_;
 
   // Tests can set this to true to disable restricting cookie access in the
   // network stack, as this can only be done once.
   static bool disable_enforcing_cookie_policies_for_tests_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainParts);
 };
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_H_