Set keyboard mic effect if available.

content/browser/renderer_host/media/media_stream_manager.cc

Index: content/browser/renderer_host/media/media_stream_manager.cc
diff --git a/content/browser/renderer_host/media/media_stream_manager.cc b/content/browser/renderer_host/media/media_stream_manager.cc
index 4080cbef29d0bfed1cf9f9e48a593639d4e47bb2..59c5fa5e191eb3b5757fc8fe9ffdb6fc62f33120 100644
--- a/content/browser/renderer_host/media/media_stream_manager.cc
+++ b/content/browser/renderer_host/media/media_stream_manager.cc
@@ -358,12 +358,18 @@ MediaStreamManager::EnumerationCache::~EnumerationCache() {
 MediaStreamManager::MediaStreamManager()
     : audio_manager_(NULL),
       monitoring_started_(false),
+#if defined(OS_CHROMEOS)
+      has_checked_keyboard_mic_(false),
+#endif
       io_loop_(NULL),
       use_fake_ui_(false) {}
 
 MediaStreamManager::MediaStreamManager(media::AudioManager* audio_manager)
     : audio_manager_(audio_manager),
       monitoring_started_(false),
+#if defined(OS_CHROMEOS)
+      has_checked_keyboard_mic_(false),
+#endif
       io_loop_(NULL),
       use_fake_ui_(false) {
   DCHECK(audio_manager_);
@@ -1072,6 +1078,16 @@ void MediaStreamManager::StartEnumeration(DeviceRequest* request) {
   // Start monitoring the devices when doing the first enumeration.
   StartMonitoring();
 
+#if defined(OS_CHROMEOS)
+  if (!has_checked_keyboard_mic_) {
+    has_checked_keyboard_mic_ = true;
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(&MediaStreamManager::CheckKeyboardMicOnUIThread,
+                   base::Unretained(this)));
+  }
+#endif
+
   // Start enumeration for devices of all requested device types.
   const MediaStreamType streams[] = { request->audio_type(),
                                       request->video_type() };
@@ -2077,4 +2093,13 @@ void MediaStreamManager::OnMediaStreamUIWindowId(MediaStreamType video_type,
   }
 }
 
+#if defined(OS_CHROMEOS)
+void MediaStreamManager::CheckKeyboardMicOnUIThread() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (CrasAudioHandler::Get()->HasKeyboardMic()) {
+    audio_manager_->SetHasKeyboardMic();

[Henrik Grunell, 2014/09/20 15:46:43]

Hmm, I guess the audio manager should be accessed on the device thread, right?
(Although this is a one-off set.)

[tommi (sloooow) - chröme, 2014/09/20 16:00:52]

Looks like |audio_manager_| is already being used on both the IO and UI thread.
However, I don't know if the method itself is thread safe.

+  }
+}
+#endif
+
 }  // namespace content