[Refactor] Introduce MediaDelegate

chrome/browser/ui/ash/chrome_shell_delegate_views.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/ash/chrome_shell_delegate.h"
 
 #include "ash/accessibility_delegate.h"
 #include "ash/magnifier/magnifier_constants.h"
+#include "ash/media_delegate.h"
 #include "ash/system/tray/default_system_tray_delegate.h"
 #include "base/command_line.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/caps_lock_delegate_views.h"
 #include "chrome/browser/ui/ash/chrome_new_window_delegate.h"
 #include "chrome/browser/ui/ash/session_state_delegate_views.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 18 matching lines @@
 
   // Overridden from ash::NewWindowDelegate:
   virtual void OpenFileManager() OVERRIDE {}
   virtual void OpenCrosh() OVERRIDE {}
   virtual void ShowKeyboardOverlay() OVERRIDE {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NewWindowDelegateImpl);
 };
 
+class MediaDelegateImpl : public ash::MediaDelegate {
+ public:
+  MediaDelegateImpl() {}
+  virtual ~MediaDelegateImpl() {}
+  virtual void HandleMediaNextTrack() OVERRIDE {}
+  virtual void HandleMediaPlayPause() OVERRIDE {}
+  virtual void HandleMediaPrevTrack() OVERRIDE {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MediaDelegateImpl);
+};
+
 class EmptyAccessibilityDelegate : public ash::AccessibilityDelegate {
  public:
   EmptyAccessibilityDelegate() {}
   virtual ~EmptyAccessibilityDelegate() {}
 
   virtual void ToggleHighContrast() OVERRIDE {
   }
 
   virtual bool IsHighContrastEnabled() const OVERRIDE {
     return false;
@@ skipping 62 matching lines @@
 void ChromeShellDelegate::PreInit() {
 }
 
 void ChromeShellDelegate::Shutdown() {
 }
 
 ash::NewWindowDelegate* ChromeShellDelegate::CreateNewWindowDelegate() {
   return new NewWindowDelegateImpl;
 }
 
+ash::MediaDelegate* ChromeShellDelegate::CreateMediaDelegate() {
+  return new MediaDelegateImpl;
+}
+
 ash::CapsLockDelegate* ChromeShellDelegate::CreateCapsLockDelegate() {
   return new CapsLockDelegate();
 }
 
 ash::SessionStateDelegate* ChromeShellDelegate::CreateSessionStateDelegate() {
   return new SessionStateDelegate;
 }
 
 ash::SystemTrayDelegate* ChromeShellDelegate::CreateSystemTrayDelegate() {
 #if defined(OS_WIN)
   return CreateWindowsSystemTrayDelegate();
 #else
   return new ash::DefaultSystemTrayDelegate;
 #endif
 }
 
 ash::AccessibilityDelegate* ChromeShellDelegate::CreateAccessibilityDelegate() {
   return new EmptyAccessibilityDelegate;
 }
 
 ash::UserWallpaperDelegate* ChromeShellDelegate::CreateUserWallpaperDelegate() {
 #if defined(OS_WIN)
   return ::CreateUserWallpaperDelegate();
 #else
   return NULL;
 #endif
 }
 
-void ChromeShellDelegate::HandleMediaNextTrack() {
-}
-
-void ChromeShellDelegate::HandleMediaPlayPause() {
-}
-
-void ChromeShellDelegate::HandleMediaPrevTrack() {
-}
-
 void ChromeShellDelegate::Observe(int type,
                                   const content::NotificationSource& source,
                                   const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_ASH_SESSION_STARTED: {
       // If we are launched to service a windows 8 search request then let the
       // IPC which carries the search string create the browser and initiate
       // the navigation.
       if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kWindows8Search))
@@ skipping 35 matching lines @@
 void ChromeShellDelegate::PlatformInit() {
 #if defined(OS_WIN)
   registrar_.Add(this,
                  chrome::NOTIFICATION_ASH_SESSION_STARTED,
                  content::NotificationService::AllSources());
   registrar_.Add(this,
                  chrome::NOTIFICATION_ASH_SESSION_ENDED,
                  content::NotificationService::AllSources());
 #endif
 }