Notify launcher page with onTransitionChanged event

ash/shell/app_list.cc

 // 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.
 
 #include <string>
 #include <vector>
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
@@ skipping 331 matching lines @@
 
   views::View* CreateStartPageWebView(const gfx::Size& size) override {
     return NULL;
   }
 
   std::vector<views::View*> CreateCustomPageWebViews(
       const gfx::Size& size) override {
     return std::vector<views::View*>();
   }
 
+  void CustomLauncherPageAnimationChanged(double progress) override {}
+
   bool IsSpeechRecognitionEnabled() override { return false; }
 
   scoped_ptr<app_list::AppListModel> model_;
   app_list::SpeechUIModel speech_ui_;
   Users users_;
 
   DISALLOW_COPY_AND_ASSIGN(ExampleAppListViewDelegate);
 };
 
 }  // namespace
 
 app_list::AppListViewDelegate* CreateAppListViewDelegate() {
   return new ExampleAppListViewDelegate;
 }
 
 }  // namespace shell
 }  // namespace ash