Encrypted Media: Implement IPC based SetCdm().

content/renderer/media/android/proxy_media_keys.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_ANDROID_PROXY_MEDIA_KEYS_H_
 #define CONTENT_RENDERER_MEDIA_ANDROID_PROXY_MEDIA_KEYS_H_
 
 #include "base/basictypes.h"
 #include "media/base/media_keys.h"
 
 class GURL;
 
 namespace content {
 
 class RendererMediaPlayerManager;
 
 // A MediaKeys proxy that wraps the EME part of RendererMediaPlayerManager.
 // TODO(xhwang): Instead of accessing RendererMediaPlayerManager directly, let
 // RendererMediaPlayerManager return a MediaKeys object that can be used by
 // ProxyDecryptor directly. Then we can remove this class!
 class ProxyMediaKeys : public media::MediaKeys {
  public:
   ProxyMediaKeys(RendererMediaPlayerManager* proxy,
-                 int cdm_id,
                  const media::SessionCreatedCB& session_created_cb,
                  const media::SessionMessageCB& session_message_cb,
                  const media::SessionReadyCB& session_ready_cb,
                  const media::SessionClosedCB& session_closed_cb,
                  const media::SessionErrorCB& session_error_cb);
   virtual ~ProxyMediaKeys();
 
   void InitializeCdm(const std::string& key_system, const GURL& frame_url);
 
   // MediaKeys implementation.
@@ skipping 12 matching lines @@
   void OnSessionCreated(uint32 session_id, const std::string& web_session_id);
   void OnSessionMessage(uint32 session_id,
                         const std::vector<uint8>& message,
                         const std::string& destination_url);
   void OnSessionReady(uint32 session_id);
   void OnSessionClosed(uint32 session_id);
   void OnSessionError(uint32 session_id,
                       media::MediaKeys::KeyError error_code,
                       uint32 system_code);
 
+  int GetCdmId() const;
+
  private:
+  // CDM ID should be unique per renderer process.
+  // TODO(xhwang): Use uint32 to prevent undefined overflow behavior.
+  static int next_cdm_id_;
+
   RendererMediaPlayerManager* manager_;
   int cdm_id_;
   media::SessionCreatedCB session_created_cb_;
   media::SessionMessageCB session_message_cb_;
   media::SessionReadyCB session_ready_cb_;
   media::SessionClosedCB session_closed_cb_;
   media::SessionErrorCB session_error_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyMediaKeys);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_ANDROID_PROXY_MEDIA_KEYS_H_