Defer input stream start around suspend and resume.

media/audio/mac/audio_low_latency_input_mac.h

Index: media/audio/mac/audio_low_latency_input_mac.h
diff --git a/media/audio/mac/audio_low_latency_input_mac.h b/media/audio/mac/audio_low_latency_input_mac.h
index 04592d2cecf2cceb4827fec4152d8af90253be4d..ae0c4057b945636c3473439bc6d9da7b9e92b814 100644
--- a/media/audio/mac/audio_low_latency_input_mac.h
+++ b/media/audio/mac/audio_low_latency_input_mac.h
@@ -39,7 +39,7 @@
 #include <AudioUnit/AudioUnit.h>
 #include <CoreAudio/CoreAudio.h>
 
-#include "base/atomicops.h"
+#include "base/cancelable_callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "media/audio/agc_audio_stream.h"
@@ -162,6 +162,9 @@ class AUAudioInputStream : public AgcAudioStream<AudioInputStream> {
   // OnData() callbacks where each callback contains this amount of bytes.
   int requested_size_bytes_;
 
+  // Used to defer Start() to workaround http://crbug.com/160920.
+  base::CancelableClosure deferred_start_cb_;
+
   DISALLOW_COPY_AND_ASSIGN(AUAudioInputStream);
 };