Set keyboard mic effect if available.

media/audio/cras/audio_manager_cras.h

Index: media/audio/cras/audio_manager_cras.h
diff --git a/media/audio/cras/audio_manager_cras.h b/media/audio/cras/audio_manager_cras.h
index a9abd6c2deb70c7b5e3858eb23b3c8fcc7ebeef5..2bf1c0d9d21b39475ed60ac3cd24ece7d64dedd9 100644
--- a/media/audio/cras/audio_manager_cras.h
+++ b/media/audio/cras/audio_manager_cras.h
@@ -29,6 +29,7 @@ class MEDIA_EXPORT AudioManagerCras : public AudioManagerBase {
       AudioDeviceNames* device_names) OVERRIDE;
   virtual AudioParameters GetInputStreamParameters(
       const std::string& device_id) OVERRIDE;
+  virtual void SetHasKeyboardMic() OVERRIDE;
 
   // AudioManagerBase implementation.
   virtual AudioOutputStream* MakeLinearOutputStream(
@@ -58,6 +59,8 @@ class MEDIA_EXPORT AudioManagerCras : public AudioManagerBase {
   AudioInputStream* MakeInputStream(const AudioParameters& params,
                                     const std::string& device_id);
 
+  bool has_keyboard_mic_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioManagerCras);
 };