Fix deferred video underflow if audio underflows first.

media/renderers/video_renderer_impl.cc

 // Copyright 2013 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.
 
 #include "media/renderers/video_renderer_impl.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ skipping 683 matching lines @@
     // we ensure that frames_queued() doesn't get excessive.
     return algorithm_->EffectiveFramesQueued() >= kMaxVideoFrames ||
            algorithm_->frames_queued() >= 3 * kMaxVideoFrames;
   }
 
   return ready_frames_.size() >= kMaxVideoFrames;
 }
 
 void VideoRendererImpl::StartSink() {
   DCHECK(task_runner_->BelongsToCurrentThread());
-  CHECK_GT(algorithm_->frames_queued(), 0u);
+  DCHECK_GT(algorithm_->frames_queued(), 0u);
   sink_->Start(this);
   sink_started_ = true;
   was_background_rendering_ = false;
 }
 
 void VideoRendererImpl::StopSink() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   sink_->Stop();
   sink_started_ = false;
   was_background_rendering_ = false;
@@ skipping 28 matching lines @@
 base::TimeTicks VideoRendererImpl::ConvertMediaTimestamp(
     base::TimeDelta media_time) {
   std::vector<base::TimeDelta> media_times(1, media_time);
   std::vector<base::TimeTicks> wall_clock_times;
   if (!wall_clock_time_cb_.Run(media_times, &wall_clock_times))
     return base::TimeTicks();
   return wall_clock_times[0];
 }
 
 }  // namespace media