Adding typing detection to the APM in chrome.

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 12c0fc5ac63415a525d6afdeb3a7de79ada8121d..1550fe72de1b00afa8d6f2f68e7da1c2fcfd4775 100644
--- a/content/renderer/media/media_stream_audio_processor.h
+++ b/content/renderer/media/media_stream_audio_processor.h
@@ -26,6 +26,7 @@ class AudioParameters;
 
 namespace webrtc {
 class AudioFrame;
+class TypingDetection;
 }
 
 namespace content {
@@ -154,6 +155,12 @@ class CONTENT_EXPORT MediaStreamAudioProcessor :
 
   // 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