Add a method to inform AudioProcessing that its output will be muted.

R=turaj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/8559004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5538 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.h b/webrtc/modules/audio_processing/audio_processing_impl.h
index 3b46ba8..9c1de30 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.h
+++ b/webrtc/modules/audio_processing/audio_processing_impl.h
@@ -70,6 +70,8 @@
   virtual int num_output_channels() const OVERRIDE;
   virtual int set_num_reverse_channels(int channels) OVERRIDE;
   virtual int num_reverse_channels() const OVERRIDE;
+  virtual void set_output_will_be_muted(bool muted) OVERRIDE;
+  virtual bool output_will_be_muted() const OVERRIDE;
   virtual int ProcessStream(AudioFrame* frame) OVERRIDE;
   virtual int AnalyzeReverseStream(AudioFrame* frame) OVERRIDE;
   virtual int set_stream_delay_ms(int delay) OVERRIDE;
@@ -136,6 +138,7 @@
   int num_reverse_channels_;
   int num_input_channels_;
   int num_output_channels_;
+  bool output_will_be_muted_;
 
   bool key_pressed_;
 };