Don't return wall clock times when time isn't ticking.

media/renderers/audio_renderer_impl.cc

 // Copyright (c) 2012 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/audio_renderer_impl.h"
 
 #include <math.h>
 
 #include <algorithm>
 
@@ skipping 152 matching lines @@
   }
 
   DVLOG(2) << __FUNCTION__ << ": " << current_media_time;
   return current_media_time;
 }
 
 bool AudioRendererImpl::GetWallClockTimes(
     const std::vector<base::TimeDelta>& media_timestamps,
     std::vector<base::TimeTicks>* wall_clock_times) {
   base::AutoLock auto_lock(lock_);
-  if (last_render_ticks_.is_null() || !playback_rate_)
+  if (last_render_ticks_.is_null() || !playback_rate_ ||
+      buffering_state_ != BUFFERING_HAVE_ENOUGH || !sink_playing_) {
     return false;
+  }
 
   DCHECK(wall_clock_times->empty());
   wall_clock_times->reserve(media_timestamps.size());
   for (const auto& media_timestamp : media_timestamps) {
     base::TimeDelta base_time;
     if (media_timestamp < audio_clock_->front_timestamp()) {
       // See notes about |media_time| values less than |base_time| in TimeSource
       // header.
       base_time = audio_clock_->front_timestamp();
     } else if (media_timestamp > audio_clock_->back_timestamp()) {
@@ skipping 577 matching lines @@
            << buffering_state;
   DCHECK_NE(buffering_state_, buffering_state);
   lock_.AssertAcquired();
   buffering_state_ = buffering_state;
 
   task_runner_->PostTask(FROM_HERE,
                          base::Bind(buffering_state_cb_, buffering_state_));
 }
 
 }  // namespace media