Add launcherPage.hide() API.

chrome/browser/ui/app_list/app_list_service_mac.mm

 // 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.
 
 #import "chrome/browser/ui/app_list/app_list_service_mac.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #import <Cocoa/Cocoa.h>
 
 #include "base/bind.h"
@@ skipping 407 matching lines @@
 
   [animation_controller_ animateWindow:app_list_window
                           targetOrigin:last_start_origin_
                                closing:YES];
 }
 
 void AppListServiceMac::ShowForCustomLauncherPage(Profile* profile) {
   NOTIMPLEMENTED();
 }
 
+void AppListServiceMac::HideCustomLauncherPage() {
+  NOTIMPLEMENTED();
+}
+
 bool AppListServiceMac::IsAppListVisible() const {
   return [GetNativeWindow() isVisible] &&
       ![animation_controller_ isClosing];
 }
 
 void AppListServiceMac::EnableAppList(Profile* initial_profile,
                                       AppListEnableSource enable_source) {
   AppListServiceImpl::EnableAppList(initial_profile, enable_source);
   AppController* controller = [NSApp delegate];
   [controller initAppShimMenuController];
@@ skipping 135 matching lines @@
 
 - (void)animationDidEnd:(NSAnimation*)animation {
   content::BrowserThread::PostTask(
       content::BrowserThread::UI,
       FROM_HERE,
       base::Bind(&AppListServiceMac::WindowAnimationDidEnd,
                  base::Unretained(GetActiveInstance())));
 }
 
 @end