Set keyboard mic effect if available.

media/audio/cras/audio_manager_cras.cc

Index: media/audio/cras/audio_manager_cras.cc
diff --git a/media/audio/cras/audio_manager_cras.cc b/media/audio/cras/audio_manager_cras.cc
index ef46176e19a648baa14dc3a6080ab7dc0c82b0e8..43d5c2e9199f87065d11266c143fbb02dea156e4 100644
--- a/media/audio/cras/audio_manager_cras.cc
+++ b/media/audio/cras/audio_manager_cras.cc
@@ -53,7 +53,8 @@ bool AudioManagerCras::HasAudioInputDevices() {
 }
 
 AudioManagerCras::AudioManagerCras(AudioLogFactory* audio_log_factory)
-    : AudioManagerBase(audio_log_factory) {
+    : AudioManagerBase(audio_log_factory),
+      has_keyboard_mic_(false) {
   SetMaxOutputStreamsAllowed(kMaxOutputStreams);
 }
 
@@ -80,12 +81,19 @@ AudioParameters AudioManagerCras::GetInputStreamParameters(
   int user_buffer_size = GetUserBufferSize();
   int buffer_size = user_buffer_size ?
       user_buffer_size : kDefaultInputBufferSize;
+  AudioParameters::PlatformEffectsMask effects =
+      has_keyboard_mic_ ? AudioParameters::KEYBOARD_MIC
+                        : AudioParameters::NO_EFFECTS;
 
   // TODO(hshi): Fine-tune audio parameters based on |device_id|. The optimal
   // parameters for the loopback stream may differ from the default.
   return AudioParameters(
       AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
-      kDefaultSampleRate, 16, buffer_size);
+      kDefaultSampleRate, 16, buffer_size, effects);
+}
+
+void AudioManagerCras::SetHasKeyboardMic() {
+  has_keyboard_mic_ = true;

[tommi (sloooow) - chröme, 2014/09/20 16:00:53]

missing thread check.  From what I can tell, it should be the same thread as
GetInputStreamParameters is called on and from e.g. the windows implementation
it looks like that's the audio manager's worker thread
(DCHECK(GetTaskRunner()->BelongsToCurrentThread());).

[Henrik Grunell, 2014/09/22 11:11:24]

Done.

 }
 
 AudioOutputStream* AudioManagerCras::MakeLinearOutputStream(