Adds Analog Gain Control (AGC) to the WebRTC client.

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 6d1b899d21017438ff450f73c89c4c7fd30d0af8..d1e507f0240145f9993fbb91233dd8c125e25b59 100644
--- a/media/audio/mac/audio_low_latency_input_mac.h
+++ b/media/audio/mac/audio_low_latency_input_mac.h
@@ -38,14 +38,17 @@
 
 #include <AudioUnit/AudioUnit.h>
 
+#include "base/atomicops.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
+#include "base/time.h"
 #include "media/audio/audio_io.h"
+#include "media/audio/audio_input_stream_impl.h"
 #include "media/audio/audio_parameters.h"
 
 class AudioManagerMac;
 
-class AUAudioInputStream : public AudioInputStream {
+class AUAudioInputStream : public AudioInputStreamImpl {
  public:
   // The ctor takes all the usual parameters, plus |manager| which is the
   // the audio manager who is creating this object.