Plumb callbacks from mojo media service to client.

media/mojo/interfaces/renderer.mojom

 // 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.
 
 module media.mojom;
 
 import "media/mojo/interfaces/demuxer_stream.mojom";
 import "media/mojo/interfaces/media_types.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 
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   // Executed if any error was encountered during decode or rendering. If
   // this error happens during an operation that has a completion callback,
   // OnError() will be called before firing the completion callback.
   OnError();
 
   // Executed for the first video frame and whenever natural size changes.
   OnVideoNaturalSizeChange(gfx.mojom.Size size);
 
   // Executed for the first video frame and whenever opacity changes.
   OnVideoOpacityChange(bool opaque);
+
+  // Called periodically to pass statistics to the web player. See
+  // media_types.mojom.
+  OnStatisticsUpdate(PipelineStatistics stats);
+
+  // Called when the remote renderering service is waiting on the decryption
+  // key.
+  OnWaitingForDecryptionKey();
 };