Reland "Adding media controls to MediaNotification"

content/browser/media/session/media_session_service_impl.h

Index: content/browser/media/session/media_session_service_impl.h
diff --git a/content/browser/media/session/media_session_service_impl.h b/content/browser/media/session/media_session_service_impl.h
index 13746248e718605a6ccff3a241dc5b0e4b970494..37629c37f38cac272a35ea274b9f40d352977b0e 100644
--- a/content/browser/media/session/media_session_service_impl.h
+++ b/content/browser/media/session/media_session_service_impl.h
@@ -12,6 +12,7 @@
 
 namespace content {
 
+class MediaSessionImpl;
 class RenderFrameHost;
 
 // There is one MediaSessionService per frame.
@@ -21,6 +22,7 @@ class MediaSessionServiceImpl : public blink::mojom::MediaSessionService {
 
   static void Create(RenderFrameHost* render_frame_host,
                      blink::mojom::MediaSessionServiceRequest request);
+  const blink::mojom::MediaSessionClientPtr& GetClient() { return client_; }
 
  private:
   explicit MediaSessionServiceImpl(RenderFrameHost* render_frame_host);
@@ -34,6 +36,10 @@ class MediaSessionServiceImpl : public blink::mojom::MediaSessionService {
   void EnableAction(blink::mojom::MediaSessionAction action) override;
   void DisableAction(blink::mojom::MediaSessionAction action) override;
 
+  // Returns the content::MediaSession this service is associated with. Only
+  // returns non-null when this service is in the top-level frame.
+  MediaSessionImpl* GetMediaSession();
+
   void Bind(blink::mojom::MediaSessionServiceRequest request);
 
   RenderFrameHost* render_frame_host_;