Introduce the ENABLE_BROWSER_CDMS macro.

content/browser/media/android/media_web_contents_observer.h

-// Copyright 2014 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 CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_H_
-#define CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_H_
-
-#include "base/compiler_specific.h"
-#include "base/containers/scoped_ptr_hash_map.h"
-#include "content/common/content_export.h"
-#include "content/public/browser/web_contents_observer.h"
-
-namespace content {
-
-class BrowserCdmManager;
-class BrowserMediaPlayerManager;
-class RenderViewHost;
-
-// This class manages all RenderFrame based media related managers at the
-// browser side. It receives IPC messages from media RenderFrameObservers and
-// forwards them to the corresponding managers. The managers are responsible
-// for sending IPCs back to the RenderFrameObservers at the render side.
-class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
- public:
-  explicit MediaWebContentsObserver(RenderViewHost* render_view_host);
-  virtual ~MediaWebContentsObserver();
-
-  // WebContentsObserver implementations.
-  virtual void RenderFrameDeleted(RenderFrameHost* render_frame_host) OVERRIDE;
-  virtual bool OnMessageReceived(const IPC::Message& message,
-                                 RenderFrameHost* render_frame_host) OVERRIDE;
-
-  // Helper functions to handle various IPC messages. Returns whether the
-  // |message| is handled in the function.
-  bool OnMediaPlayerMessageReceived(const IPC::Message& message,
-                                    RenderFrameHost* render_frame_host);
-  bool OnCdmMessageReceived(const IPC::Message& message,
-                            RenderFrameHost* render_frame_host);
-  bool OnMediaPlayerSetCdmMessageReceived(const IPC::Message& message,
-                                          RenderFrameHost* render_frame_host);
-
-  // Gets the media player manager associated with |render_frame_host|. Creates
-  // a new one if it doesn't exist. The caller doesn't own the returned pointer.
-  BrowserMediaPlayerManager* GetMediaPlayerManager(
-      RenderFrameHost* render_frame_host);
-
-  // Gets the CDM manager associated with |render_frame_host|. Creates
-  // a new one if it doesn't exist. The caller doesn't own the returned pointer.
-  BrowserCdmManager* GetCdmManager(RenderFrameHost* render_frame_host);
-
-  void OnSetCdm(RenderFrameHost* render_frame_host, int player_id, int cdm_id);
-
-  // Pauses all media player.
-  void PauseVideo();
-
-#if defined(VIDEO_HOLE)
-  void OnFrameInfoUpdated();
-#endif  // defined(VIDEO_HOLE)
-
- private:
-  // Map from RenderFrameHost* to BrowserMediaPlayerManager.
-  typedef base::ScopedPtrHashMap<uintptr_t, BrowserMediaPlayerManager>
-      MediaPlayerManagerMap;
-  MediaPlayerManagerMap media_player_managers_;
-
-  // Map from RenderFrameHost* to BrowserCdmManager.
-  typedef base::ScopedPtrHashMap<uintptr_t, BrowserCdmManager> CdmManagerMap;
-  CdmManagerMap cdm_managers_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserver);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_H_