media: Add MediaPermission interface and MediaPermissionDispatcher.

media/blink/webencryptedmediaclient_impl.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 MEDIA_BLINK_WEBENCRYPTEDMEDIACLIENT_IMPL_H_
 #define MEDIA_BLINK_WEBENCRYPTEDMEDIACLIENT_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "media/base/cdm_factory.h"
 #include "media/base/media_export.h"
 #include "third_party/WebKit/public/platform/WebEncryptedMediaClient.h"
 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
 
 namespace media {
 
+class MediaPermission;
+
 class MEDIA_EXPORT WebEncryptedMediaClientImpl
     : public blink::WebEncryptedMediaClient {
  public:
-  WebEncryptedMediaClientImpl(scoped_ptr<CdmFactory> cdm_factory);
+  WebEncryptedMediaClientImpl(scoped_ptr<CdmFactory> cdm_factory,
+                              MediaPermission* media_permission);
   virtual ~WebEncryptedMediaClientImpl();
 
   // WebEncryptedMediaClient implementation.
   virtual void requestMediaKeySystemAccess(
       blink::WebEncryptedMediaRequest request);
 
  private:
   scoped_ptr<CdmFactory> cdm_factory_;
+  MediaPermission* media_permission_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBENCRYPTEDMEDIACLIENT_IMPL_H_