Switch to STA mode for audio thread and WASAPI I/O streams.

media/audio/win/audio_manager_win.cc

Index: media/audio/win/audio_manager_win.cc
diff --git a/media/audio/win/audio_manager_win.cc b/media/audio/win/audio_manager_win.cc
index c09fb46284d6d8f4d1126816bf87d3dc6a9bee2e..9742fc9d66b780fd30a6e6e34a7218665250f2ef 100644
--- a/media/audio/win/audio_manager_win.cc
+++ b/media/audio/win/audio_manager_win.cc
@@ -129,23 +129,21 @@ static int NumberOfWaveOutBuffers() {
 }
 
 AudioManagerWin::AudioManagerWin(AudioLogFactory* audio_log_factory)
-    : AudioManagerBase(audio_log_factory),
-      // |CoreAudioUtil::IsSupported()| uses static variables to avoid doing
-      // multiple initializations.  This is however not thread safe.
-      // So, here we call it explicitly before we kick off the audio thread
-      // or do any other work.
-      enumeration_type_(CoreAudioUtil::IsSupported() ?
-          kMMDeviceEnumeration : kWaveEnumeration) {
+    : AudioManagerBase(audio_log_factory), enumeration_type_(kNoEnumeration) {
   SetMaxOutputStreamsAllowed(kMaxOutputStreams);
 
   // WARNING: This is executed on the UI loop, do not add any code here which
   // loads libraries or attempts to call out into the OS.  Instead add such code
   // to the InitializeOnAudioThread() method below.
+  //
+  // WARNING: Do not make any calls to CoreAudioUtil within the constructor, it
+  // will attempt to perform COM initialization.
 
   // Task must be posted last to avoid races from handing out "this" to the
   // audio thread.
-  GetTaskRunner()->PostTask(FROM_HERE, base::Bind(
-      &AudioManagerWin::InitializeOnAudioThread, base::Unretained(this)));
+  GetTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&AudioManagerWin::InitializeOnAudioThread,
+                            base::Unretained(this)));
 }
 
 AudioManagerWin::~AudioManagerWin() {
@@ -166,6 +164,8 @@ bool AudioManagerWin::HasAudioInputDevices() {
 
 void AudioManagerWin::InitializeOnAudioThread() {
   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
+  enumeration_type_ =
+      CoreAudioUtil::IsSupported() ? kMMDeviceEnumeration : kWaveEnumeration;
 
   if (core_audio_supported()) {
     // AudioDeviceListenerWin must be initialized on a COM thread and should
@@ -517,7 +517,7 @@ AudioInputStream* AudioManagerWin::CreatePCMWaveInAudioInputStream(
     const std::string& device_id) {
   std::string xp_device_id = device_id;
   if (device_id != AudioManagerBase::kDefaultDeviceId &&
-      enumeration_type_ == kMMDeviceEnumeration) {
+      enumeration_type() == kMMDeviceEnumeration) {
     xp_device_id = ConvertToWinXPInputDeviceId(device_id);
     if (xp_device_id.empty()) {
       DLOG(ERROR) << "Cannot find a waveIn device which matches the device ID "