Add OnDurationChange() to RenderClient

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";
 import "url/mojo/url.mojom";
@@ skipping 51 matching lines @@
   // 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();
+
+  // Executed the first time the metadata is updated, and whenever the duration
+  // changes.
+  OnDurationChange(int64 duration_usec);
 };