Add UMA for first app list paint on Windows.

chrome/browser/ui/app_list/app_list_service_impl.cc

 // 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.
 
 #include "chrome/browser/ui/app_list/app_list_service_impl.h"
 
 #include "apps/pref_names.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 99 matching lines @@
       profile_load_sequence_id_(0),
       pending_profile_loads_(0),
       weak_factory_(this),
       profile_loader_(g_browser_process->profile_manager()) {
   ProfileManager* profile_manager = g_browser_process->profile_manager();
   profile_manager->GetProfileInfoCache().AddObserver(this);
 }
 
 AppListServiceImpl::~AppListServiceImpl() {}
 
+void AppListServiceImpl::SetAppListNextPaintCallback(
+    const base::Closure& callback) {}
+
 void AppListServiceImpl::HandleFirstRun() {}
 
 void AppListServiceImpl::Init(Profile* initial_profile) {}
 
 base::FilePath AppListServiceImpl::GetProfilePath(
     const base::FilePath& user_data_dir) {
   PrefService* local_state = g_browser_process->local_state();
   DCHECK(local_state);
 
   std::string app_list_profile;
@@ skipping 68 matching lines @@
   profile_loader_.InvalidatePendingProfileLoads();
 }
 
 void AppListServiceImpl::HandleCommandLineFlags(Profile* initial_profile) {
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableAppList))
     EnableAppList(initial_profile);
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableAppList))
     SetAppListEnabledPreference(false);
 }