media: Add MediaPermission interface and MediaPermissionDispatcher.

media/blink/webencryptedmediaclient_impl.h

Index: media/blink/webencryptedmediaclient_impl.h
diff --git a/media/blink/webencryptedmediaclient_impl.h b/media/blink/webencryptedmediaclient_impl.h
index 2b4e9d5de13cfe910878047c9409b7c12dc01500..ad0062ad8f8909f4c60fa719513288f2166cfa84 100644
--- a/media/blink/webencryptedmediaclient_impl.h
+++ b/media/blink/webencryptedmediaclient_impl.h
@@ -13,10 +13,13 @@
 
 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.
@@ -25,6 +28,7 @@ class MEDIA_EXPORT WebEncryptedMediaClientImpl
 
  private:
   scoped_ptr<CdmFactory> cdm_factory_;
+  MediaPermission* media_permission_;
 };
 
 }  // namespace media