Add detection for repeated audio in capturing.

content/renderer/media/media_stream_audio_processor.h

Index: content/renderer/media/media_stream_audio_processor.h
diff --git a/content/renderer/media/media_stream_audio_processor.h b/content/renderer/media/media_stream_audio_processor.h
index 4b74ca0a24090d73f7649b93a36dce24d2f9c62b..7e1ad0aa479dbdcc7e5a74ee0f28a178732309e0 100644
--- a/content/renderer/media/media_stream_audio_processor.h
+++ b/content/renderer/media/media_stream_audio_processor.h
@@ -14,6 +14,7 @@
 #include "content/common/content_export.h"
 #include "content/public/common/media_stream_request.h"
 #include "content/renderer/media/aec_dump_message_filter.h"
+#include "content/renderer/media/audio_repetition_detector.h"
 #include "content/renderer/media/webrtc_audio_device_impl.h"
 #include "media/base/audio_converter.h"
 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
@@ -153,6 +154,9 @@ class CONTENT_EXPORT MediaStreamAudioProcessor :
   // both the capture audio thread and the render audio thread.
   base::subtle::Atomic32 render_delay_ms_;
 
+  // Module to detect and report (to UMA) bit exact audio repetition.
+  scoped_ptr<AudioRepetitionDetector> audio_repetition_detector_;

[ajm, 2015/09/30 00:23:43]

I don't see any reason this needs to use a scoped_ptr.

[minyue, 2015/09/30 19:52:32]

good point. I simply followed the momentum of other modules, but true, it does
not need a pointer.

+
   // Module to handle processing and format conversion.
   scoped_ptr<webrtc::AudioProcessing> audio_processing_;