Add UMA for the app list doodle being clicked.

chrome/browser/ui/webui/app_list/start_page_handler.h

 // Copyright 2013 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_UI_WEBUI_APP_LIST_START_PAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_APP_LIST_START_PAGE_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 29 matching lines @@
       content::BrowserContext* browser_context,
       const extensions::Extension* extension,
       extensions::UnloadedExtensionInfo::Reason reason) override;
 
 #if defined(OS_CHROMEOS)
   // Called when the pref has been changed.
   void OnHotwordEnabledChanged();
 #endif
 
   // JS callbacks.
+  void HandleAppListShown(const base::ListValue* args);
+  void HandleDoodleClicked(const base::ListValue* args);
   void HandleInitialize(const base::ListValue* args);
   void HandleLaunchApp(const base::ListValue* args);
   void HandleSpeechResult(const base::ListValue* args);
   void HandleSpeechSoundLevel(const base::ListValue* args);
   void HandleSpeechRecognition(const base::ListValue* args);
 
   PrefChangeRegistrar pref_change_registrar_;
 
   ScopedObserver<extensions::ExtensionRegistry,
                  extensions::ExtensionRegistryObserver>
       extension_registry_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(StartPageHandler);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_WEBUI_APP_LIST_START_PAGE_HANDLER_H_