Make RendererMediaPlayerManager a RenderFrameObserver.

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 <map>
+
+#include "base/compiler_specific.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+
+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;
+
+  // Gets the media player manager associated with |render_frame_host|. Creates
+  // a new one if it doesn't exist.
+  BrowserMediaPlayerManager* GetMediaPlayerManager(
+      RenderFrameHost* render_frame_host);
+
+ private:
+  // Map from RenderFrameHost to BrowserMediaPlayerManager.
+  std::map<RenderFrameHost*, BrowserMediaPlayerManager*> media_player_managers_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserver);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_WEB_CONTENTS_OBSERVER_H_