Not for submission. fastSeek prototype.

media/base/renderer_client.h

 // Copyright 2016 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.
 
 #ifndef MEDIA_BASE_RENDERER_CLIENT_H_
 #define MEDIA_BASE_RENDERER_CLIENT_H_
 
 #include "base/time/time.h"
 #include "media/base/pipeline_status.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace media {
 
 // Interface used by Renderer, AudioRenderer, VideoRenderer and
 // MediaPlayerRenderer implementations to notify their clients.
 class RendererClient {
  public:
   // Executed if any error was encountered after Renderer initialization.
   virtual void OnError(PipelineStatus status) = 0;
 
   // Executed when rendering has reached the end of stream.
   virtual void OnEnded() = 0;
 
   // Executed periodically with rendering statistics.
   virtual void OnStatisticsUpdate(const PipelineStatistics& stats) = 0;
 
+  virtual void OnFirstVideoFrameTimestampKnown(base::TimeDelta timestamp) = 0;
+
   // Executed when buffering state is changed.
   virtual void OnBufferingStateChange(BufferingState state) = 0;
 
   // Executed whenever the key needed to decrypt the stream is not available.
   virtual void OnWaitingForDecryptionKey() = 0;
 
   // Executed for the first video frame and whenever natural size changes.
   // Only used if media stream contains video track.
   virtual void OnVideoNaturalSizeChange(const gfx::Size& size) = 0;
 
   // Executed for the first video frame and whenever opacity changes.
   // Only used if media stream contains video track.
   virtual void OnVideoOpacityChange(bool opaque) = 0;
 
   // Executed when video metadata is first read, and whenever it changes.
   // Only used when we are using a URL demuxer (e.g. for MediaPlayerRenderer).
   virtual void OnDurationChange(base::TimeDelta duration) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_RENDERER_CLIENT_H_