Have AudioRendererImpl advance time until it's told to stop.

media/filters/audio_clock.cc

Index: media/filters/audio_clock.cc
diff --git a/media/filters/audio_clock.cc b/media/filters/audio_clock.cc
index eae807ece581bf3b03d41864f472d66fc5cc35c2..336037ad9af676010171367535eb02c7c29eb210 100644
--- a/media/filters/audio_clock.cc
+++ b/media/filters/audio_clock.cc
@@ -19,7 +19,7 @@ AudioClock::AudioClock(base::TimeDelta start_timestamp, int sample_rate)
           sample_rate),
       total_buffered_frames_(0),
       current_media_timestamp_(start_timestamp),
-      audio_data_buffered_(0) {
+      latest_media_timestamp_(start_timestamp) {
 }
 
 AudioClock::~AudioClock() {
@@ -50,19 +50,19 @@ void AudioClock::WroteAudio(int frames_written,
   PushBufferedAudioData(frames_requested - frames_written, 0.0f);
   PopBufferedAudioData(frames_played);
 
+  latest_media_timestamp_ += base::TimeDelta::FromMicroseconds(
+      frames_written * playback_rate * microseconds_per_frame_);
+
   // Update cached values.
   double scaled_frames = 0;
   double scaled_frames_at_same_rate = 0;
   bool found_silence = false;
-  audio_data_buffered_ = false;
   for (size_t i = 0; i < buffered_.size(); ++i) {
     if (buffered_[i].playback_rate == 0) {
       found_silence = true;
       continue;
     }
 
-    audio_data_buffered_ = true;
-
     // Any buffered silence breaks our contiguous stretch of audio data.
     if (found_silence)
       break;