Fix VirtualAudioInputStream callback timing issues.

media/audio/virtual_audio_input_stream.h

 // 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.
 
 #ifndef MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_
 #define MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_
 
 #include <map>
 #include <set>
 
@@ skipping 58 matching lines @@
   // When Start() is called on this class, we continuously schedule this
   // callback to render audio using any attached VirtualAudioOutputStreams until
   // Stop() is called.
   void ReadAudio();
 
   AudioManagerBase* audio_manager_;
   base::MessageLoopProxy* message_loop_;
   AudioInputCallback* callback_;
 
   // Non-const for testing.
-  base::TimeDelta buffer_duration_ms_;
+  base::TimeDelta buffer_duration_;
+  base::Time next_read_time_;
   scoped_array<uint8> buffer_;
   AudioParameters params_;
   scoped_ptr<AudioBus> audio_bus_;
   base::CancelableClosure on_more_data_cb_;
 
   // AudioConverters associated with the attached VirtualAudioOutputStreams,
   // partitioned by common AudioParameters.
   AudioConvertersMap converters_;
 
   // AudioConverter that takes all the audio converters and mixes them into one
   // final audio stream.
   AudioConverter mixer_;
 
   // Number of currently attached VirtualAudioOutputStreams.
   int num_attached_outputs_streams_;
 
   DISALLOW_COPY_AND_ASSIGN(VirtualAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_