Media Remoting: Add remoting control logic for encrypted contents.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 8e21346e919135488c0ee73d421c947f1b7d4ad7..56104f20b8e91f49d1b3184fd0a09819e7dad985 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -104,7 +104,8 @@ class CdmFactory;
 class DecoderFactory;
 class MediaPermission;
 class MediaServiceProvider;
-class RemotingController;
+class RemotingRendererController;
+class RemotingSinkObserver;
 class RendererWebMediaPlayerDelegate;
 class SurfaceManager;
 class UrlIndex;
@@ -1074,9 +1075,10 @@ class CONTENT_EXPORT RenderFrameImpl
   void InitializeBlameContext(RenderFrameImpl* parent_frame);
 
 #if BUILDFLAG(ENABLE_MEDIA_REMOTING)
-  // Creates the RemotingController to control whether to switch to/from media
-  // remoting from/to local playback.
-  std::unique_ptr<media::RemotingController> CreateRemotingController();
+  // Creates the RemotingRendererController to control whether to switch to/from
+  // media remoting from/to local playback.
+  std::unique_ptr<media::RemotingRendererController>
+  CreateRemotingRendererController();
 #endif
 
   // Stores the WebLocalFrame we are associated with.  This is null from the
@@ -1224,6 +1226,12 @@ class CONTENT_EXPORT RenderFrameImpl
   // Lazy-bound pointer to the RemoterFactory service in the browser
   // process. Always use the GetRemoterFactory() accessor instead of this.
   media::mojom::RemoterFactoryPtr remoter_factory_;
+  // An observer for the remoting sink availability that is used by
+  // media::RemotingCdmFactory to initialize media::RemotingSourceImpl. Created
+  // in the constructor of RenderFrameImpl to make sure
+  // media::RemotingSourceImpl be intialized with correct availability info.
+  // Own by media::RemotingCdmFactory after it is created.
+  std::unique_ptr<media::RemotingSinkObserver> remoting_sink_observer_;
 #endif
 
   // The CDM and decoder factory attached to this frame, lazily initialized.