Adding key press detection in the browser process.

content/renderer/media/webrtc_audio_capturer.cc

Index: content/renderer/media/webrtc_audio_capturer.cc
diff --git a/content/renderer/media/webrtc_audio_capturer.cc b/content/renderer/media/webrtc_audio_capturer.cc
index 90e2482efa37c6664c80bfadbaf27d497f5e2739..005d19285c2efbdb6f1489a2e4468395e840789a 100644
--- a/content/renderer/media/webrtc_audio_capturer.cc
+++ b/content/renderer/media/webrtc_audio_capturer.cc
@@ -374,7 +374,8 @@ void WebRtcAudioCapturer::SetAutomaticGainControl(bool enable) {
 
 void WebRtcAudioCapturer::Capture(media::AudioBus* audio_source,
                                   int audio_delay_milliseconds,
-                                  double volume) {
+                                  double volume,
+                                  bool key_pressed) {
   // This callback is driven by AudioInputDevice::AudioThreadCallback if
   // |source_| is AudioInputDevice, otherwise it is driven by client's
   // CaptureCallback.
@@ -405,8 +406,11 @@ void WebRtcAudioCapturer::Capture(media::AudioBus* audio_source,
        it != tracks.end();
        ++it) {
     (*it)->CaptureData(buffer_ref_while_calling->buffer(),
-                       audio_source->channels(), audio_source->frames(),
-                       audio_delay_milliseconds, volume);
+                       audio_source->channels(),
+                       audio_source->frames(),
+                       audio_delay_milliseconds,
+                       volume,
+                       key_pressed);
   }
 }