Add video-rendering to mojo media pipeline.

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.interfaces;
 
 import "media/mojo/interfaces/demuxer_stream.mojom";
 import "media/mojo/interfaces/media_types.mojom";
+import "ui/mojo/geometry/geometry.mojom";
 
 interface Renderer {
   // Initializes the Renderer with one or both of an audio and video stream,
   // executing the callback with whether the initialization succeeded.
   Initialize(RendererClient client,
              DemuxerStream? audio,
              DemuxerStream? video) => (bool success);
 
   // Discards any buffered data, executing callback when completed.
   // NOTE: If an error occurs, RendererClient::OnError() can be called
@@ skipping 17 matching lines @@
 interface RendererClient {
   // Called to report media time advancement by |time_usec|.
   // |time_usec| and |max_time_usec| can be used to interpolate time between
   // calls to OnTimeUpdate().
   // |max_time_usec| is typically the media timestamp of the last audio frame
   //     buffered by the audio hardware.
   // |max_time_usec| must be greater or equal to |time_usec|.
   OnTimeUpdate(int64 time_usec, int64 max_time_usec);
 
   // Called to report buffering state changes, see media_types.mojom.
   OnBufferingStateChange(BufferingState state);

[xhwang, 2016/04/12 19:40:37]

(not for this CL) This should be OnBufferingStateChange_d_ to be consistent with
the rest of the pipeline.

[alokp, 2016/04/19 00:16:07]

added TODO

 
+  // Called to report video natural size change.
+  OnNaturalSizeChanged(mojo.Size size);
+
   // Executed when rendering has reached the end of stream.
   OnEnded();
 
   // 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();
 };