Fix wrong timing when audio is muted.

media/audio/audio_output_mixer.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/audio/audio_output_mixer.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 176 matching lines @@
       proxy_data->pending_bytes = buffers_state.pending_bytes;
 
     // Note: there is no way we can deduce hardware_delay_bytes for the
     // particular proxy stream. Use zero instead.
     uint32 actual_size = proxy_data->audio_source_callback->OnMoreData(
         actual_dest,
         max_size,
         AudioBuffersState(proxy_data->pending_bytes, 0));
     if (actual_size == 0)
       continue;
-
-    // No need to mix muted stream.
     double volume = proxy_data->volume;
-    if (volume == 0.0)
-      continue;
 
     // Different handling for first and all subsequent streams.
     if (first_stream) {
       if (volume != 1.0) {
         media::AdjustVolume(actual_dest,
                             actual_size,
                             params_.channels(),
                             bytes_per_sample,
                             volume);
       }
@@ skipping 31 matching lines @@
 }
 
 void AudioOutputMixer::WaitTillDataReady() {
   base::AutoLock lock(lock_);
   for (ProxyMap::iterator it = proxies_.begin(); it != proxies_.end(); ++it) {
     it->second.audio_source_callback->WaitTillDataReady();
   }
 }
 
 }  // namespace media