Add UMA for first app list paint on Windows.

chrome/browser/ui/app_list/app_list_service.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_APP_LIST_APP_LIST_SERVICE_H_
 #define CHROME_BROWSER_UI_APP_LIST_APP_LIST_SERVICE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/native_widget_types.h"
 
 class AppListControllerDelegate;
 class CommandLine;
 class PrefRegistrySimple;
 class Profile;
 
 namespace base {
 class FilePath;
 }
 
 namespace gfx {
 class ImageSkia;
 }
 
 class AppListService {
  public:
   // Get the AppListService for the current platform and desktop type.
   static AppListService* Get();
 
   // Call Init for all AppListService instances on this platform.
   static void InitAll(Profile* initial_profile);
 
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   static void RecordShowTimings(const CommandLine& command_line);
 
+  // Indicates that |callback| should be called next time the app list is
+  // painted.
+  virtual void SetAppListNextPaintCallback(const base::Closure& callback) = 0;
+
   // Perform Chrome first run logic. This is executed before Chrome's threads
   // have been created.
   virtual void HandleFirstRun() = 0;
 
   virtual base::FilePath GetProfilePath(
       const base::FilePath& user_data_dir) = 0;
   virtual void SetProfilePath(const base::FilePath& profile_path) = 0;
 
   // Show the app list for the profile configured in the user data dir for the
   // current browser process.
@@ skipping 31 matching lines @@
   virtual ~AppListService() {}
 
   // Do any once off initialization needed for the app list.
   virtual void Init(Profile* initial_profile) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AppListService);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_APP_LIST_SERVICE_H_