Wire up AGC to the MediaStreamAudioProcessor

content/renderer/media/media_stream_audio_processor_options.cc

Index: content/renderer/media/media_stream_audio_processor_options.cc
diff --git a/content/renderer/media/media_stream_audio_processor_options.cc b/content/renderer/media/media_stream_audio_processor_options.cc
index cffc5a17e2c699d84fdb76e18b42036660bfed7a..51f52abb132187e37c84e62bec800123227ab220 100644
--- a/content/renderer/media/media_stream_audio_processor_options.cc
+++ b/content/renderer/media/media_stream_audio_processor_options.cc
@@ -39,10 +39,8 @@ struct {
     webrtc::MediaConstraintsInterface::kValueTrue },
   { webrtc::MediaConstraintsInterface::kHighpassFilter,
     webrtc::MediaConstraintsInterface::kValueTrue },
-  // TODO(xians): Verify if it is OK to set typing detection to kValueFalse as
-  // default.
   { webrtc::MediaConstraintsInterface::kTypingNoiseDetection,
-    webrtc::MediaConstraintsInterface::kValueFalse },
+    webrtc::MediaConstraintsInterface::kValueTrue },
 };
 
 } // namespace
@@ -122,7 +120,6 @@ void EnableHighPassFilter(AudioProcessing* audio_processing) {
   CHECK_EQ(audio_processing->high_pass_filter()->Enable(true), 0);
 }
 
-// TODO(xians): stereo swapping
 void EnableTypingDetection(AudioProcessing* audio_processing) {
   int err = audio_processing->voice_detection()->Enable(true);
   err |= audio_processing->voice_detection()->set_likelihood(
@@ -163,4 +160,15 @@ void StopAecDump(AudioProcessing* audio_processing) {
     DLOG(ERROR) << "Fail to stop AEC debug recording";
 }
 
+void EnableAutomaticGainControl(AudioProcessing* audio_processing) {
+#if defined(OS_ANDROID) || defined(OS_IOS)
+  const webrtc::GainControl::Mode mode = webrtc::GainControl::kAdaptiveAnalog;
+#else
+  const webrtc::GainControl::Mode mode = webrtc::GainControl::kAdaptiveAnalog;
+#endif
+  int err = audio_processing->gain_control()->set_mode(mode);
+  err |= audio_processing->gain_control()->Enable(true);
+  CHECK_EQ(err, 0);
+}
+
 }  // namespace content