1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_ 6 #define CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_ 7 8 #include "content/public/browser/notification_registrar.h" 9 #include "content/public/browser/notification_observer.h" 10 11 namespace chrome { 12 13 // This object is instantiated when the first Browser object is added to the 14 // list and delete when the last one is removed. It watches for loads and 15 // creates histograms of some global object counts. 16 class UMABrowsingActivityObserver : public content::NotificationObserver { 17 public: 18 static void Init(); 19 20 private: 21 UMABrowsingActivityObserver(); 22 virtual ~UMABrowsingActivityObserver(); 23 24 // content::NotificationObserver implementation. 25 virtual void Observe(int type, 26 const content::NotificationSource& source, 27 const content::NotificationDetails& details) OVERRIDE; 28 29 // Counts the number of active RenderProcessHosts and logs them. 30 void LogRenderProcessHostCount() const; 31 32 // Counts the number of tabs in each browser window and logs them. This is 33 // different than the number of WebContents objects since WebContents objects 34 // can be used for popups and in dialog boxes. We're just counting toplevel 35 // tabs here. 36 void LogBrowserTabCount() const; 37 38 content::NotificationRegistrar registrar_; 39 40 DISALLOW_COPY_AND_ASSIGN(UMABrowsingActivityObserver); 41 }; 42 43 } // namespace chrome 44 45 #endif // CHROME_BROWSER_UI_UMA_BROWSING_ACTIVITY_OBSERVER_H_ 46