Adds COM init to AudioManager thread for Windows

media/audio/audio_manager_base.h

Index: media/audio/audio_manager_base.h
diff --git a/media/audio/audio_manager_base.h b/media/audio/audio_manager_base.h
index 61f95834145048c408f5a5ceaef72078dcd95919..a7f30bf49fce6977b628de21a5a500dd137630ba 100644
--- a/media/audio/audio_manager_base.h
+++ b/media/audio/audio_manager_base.h
@@ -12,16 +12,30 @@
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
+#include "base/threading/thread.h"
+#include "base/win/scoped_com_initializer.h"
 #include "media/audio/audio_manager.h"
 
-namespace base {
-class Thread;
-}
-
 namespace media {
 
 class AudioOutputDispatcher;
 
+// Initializes the COM library for use by this thread and sets the thread's
+// concurrency model to multi-threaded.

[tommi (sloooow) - chröme, 2012/09/17 15:56:45]

s/concurrency model to multi-threaded/COM threading model on Windows to MTA.

[henrika (OOO until Aug 14), 2012/09/17 16:43:29]

Done.

+class AudioThread : public base::Thread {

[scherkus (not reviewing), 2012/09/17 16:23:48]

nit: this class can be forward declared + moved to .cc

[henrika (OOO until Aug 14), 2012/09/17 16:43:29]

Done.

+public:

[tommi (sloooow) - chröme, 2012/09/17 15:56:45]

indent (and below)

[henrika (OOO until Aug 14), 2012/09/17 16:43:29]

Done.

+  explicit AudioThread(const char* name);
+  virtual ~AudioThread();
+
+protected:
+  virtual void Init() OVERRIDE;
+  virtual void CleanUp() OVERRIDE;
+
+private:
+  scoped_ptr<base::win::ScopedCOMInitializer> com_initializer_;
+  DISALLOW_COPY_AND_ASSIGN(AudioThread);
+};
+
 // AudioManagerBase provides AudioManager functions common for all platforms.
 class MEDIA_EXPORT AudioManagerBase : public AudioManager {
  public:
@@ -108,7 +122,7 @@ class MEDIA_EXPORT AudioManagerBase : public AudioManager {
 
   // Thread used to interact with AudioOutputStreams created by this
   // audio manger.
-  scoped_ptr<base::Thread> audio_thread_;
+  scoped_ptr<media::AudioThread> audio_thread_;
   mutable base::Lock audio_thread_lock_;
 
   // Map of cached AudioOutputDispatcher instances.  Must only be touched