Adding typing detection to the APM in chrome.

content/renderer/media/media_stream_audio_processor.h

 // Copyright 2013 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 CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_H_
 
 #include "base/atomicops.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "media/base/audio_converter.h"
 #include "third_party/webrtc/modules/audio_processing/include/audio_processing.h"
 #include "third_party/webrtc/modules/interface/module_common_types.h"
 
 namespace blink {
 class WebMediaConstraints;
 }
 
 namespace media {
 class AudioBus;
 class AudioFifo;
 class AudioParameters;
 }  // namespace media
 
 namespace webrtc {
 class AudioFrame;
+class TypingDetection;
 }
 
 namespace content {
 
 class RTCMediaConstraints;
 
 // This class owns an object of webrtc::AudioProcessing which contains signal
 // processing components like AGC, AEC and NS. It enables the components based
 // on the getUserMedia constraints, processes the data and outputs it in a unit
 // of 10 ms data chunk.
@@ skipping 108 matching lines @@
   base::ThreadChecker main_thread_checker_;
 
   // Used to DCHECK that some methods are called on the capture audio thread.
   base::ThreadChecker capture_thread_checker_;
 
   // Used to DCHECK that PushRenderData() is called on the render audio thread.
   base::ThreadChecker render_thread_checker_;
 
   // Flag to enable the stereo channels mirroring.
   bool audio_mirroring_;
+
+  // Used by the typing detection.
+  scoped_ptr<webrtc::TypingDetection> typing_detector_;
+
+  // Result from the typing detection.
+  bool typing_detected_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_H_