Add media Remoter mojo interface and RendererWMPDelegate accessor.

media/blink/webmediaplayer_delegate.h

Index: media/blink/webmediaplayer_delegate.h
diff --git a/media/blink/webmediaplayer_delegate.h b/media/blink/webmediaplayer_delegate.h
index c70b07f38c6aed1020ee668917f32d06a081f62c..07599ac445d00c7980551d8635b9ba6559214c36 100644
--- a/media/blink/webmediaplayer_delegate.h
+++ b/media/blink/webmediaplayer_delegate.h
@@ -5,6 +5,8 @@
 #ifndef MEDIA_BLINK_WEBMEDIAPLAYER_DELEGATE_H_
 #define MEDIA_BLINK_WEBMEDIAPLAYER_DELEGATE_H_
 
+#include "media/mojo/interfaces/remoter.mojom.h"
+
 namespace blink {
 class WebMediaPlayer;
 }
@@ -68,6 +70,9 @@ class WebMediaPlayerDelegate {
   // Returns whether the render frame is currently hidden.
   virtual bool IsHidden() = 0;
 
+  // Returns a pointer to the media Remoter, or null if none is available.
+  virtual mojom::Remoter* GetRemoter() = 0;
+
  protected:
   virtual ~WebMediaPlayerDelegate() {}
 };