Defer input stream start around suspend and resume.

media/audio/mac/audio_input_mac.h

Index: media/audio/mac/audio_input_mac.h
diff --git a/media/audio/mac/audio_input_mac.h b/media/audio/mac/audio_input_mac.h
index 77eb65b03159626ac54b852ea4ba61fe00bf0bdc..e8f77c706aeaf413cce9a9a535b341b36d65ce38 100644
--- a/media/audio/mac/audio_input_mac.h
+++ b/media/audio/mac/audio_input_mac.h
@@ -8,6 +8,7 @@
 #include <AudioToolbox/AudioFormat.h>
 #include <AudioToolbox/AudioQueue.h>
 
+#include "base/cancelable_callback.h"
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 #include "media/audio/audio_io.h"
@@ -15,14 +16,14 @@
 
 namespace media {
 
-class AudioManagerBase;
+class AudioManagerMac;
 
 // Implementation of AudioInputStream for Mac OS X using the audio queue service
 // present in OS 10.5 and later. Design reflects PCMQueueOutAudioOutputStream.
 class PCMQueueInAudioInputStream : public AudioInputStream {
  public:
   // Parameters as per AudioManager::MakeAudioInputStream.
-  PCMQueueInAudioInputStream(AudioManagerBase* manager,
+  PCMQueueInAudioInputStream(AudioManagerMac* manager,
                              const AudioParameters& params);
   virtual ~PCMQueueInAudioInputStream();
 
@@ -66,7 +67,7 @@ class PCMQueueInAudioInputStream : public AudioInputStream {
   static const int kNumberBuffers = 3;
 
   // Manager that owns this stream, used for closing down.
-  AudioManagerBase* manager_;
+  AudioManagerMac* manager_;
   // We use the callback mostly to periodically supply the recorded audio data.
   AudioInputCallback* callback_;
   // Structure that holds the stream format details such as bitrate.
@@ -79,6 +80,8 @@ class PCMQueueInAudioInputStream : public AudioInputStream {
   bool started_;
   // Used to determine if we need to slow down |callback_| calls.
   base::TimeTicks last_fill_;
+  // Used to defer Start() to workaround http://crbug.com/160920.
+  base::CancelableClosure deferred_start_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMQueueInAudioInputStream);
 };