Adds AudioDevice factory for all audio clients in Chrome

content/renderer/media/audio_device.h

Index: content/renderer/media/audio_device.h
diff --git a/content/renderer/media/audio_device.h b/content/renderer/media/audio_device.h
index 74b28d33d8558d2a8ed97f03f7ff0d5ecc6a23d3..f9a159310887da2925d127af3e9f31aee1069f59 100644
--- a/content/renderer/media/audio_device.h
+++ b/content/renderer/media/audio_device.h
@@ -76,6 +76,8 @@
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
 
+class AudioMessageFilter;
+
 namespace media {
 class AudioParameters;
 }
@@ -87,10 +89,9 @@ class CONTENT_EXPORT AudioDevice
  public:
   // Methods called on main render thread -------------------------------------
 
-  // Minimal constructor where Initialize() must be called later.
+  // Minimal constructors where Initialize() must be called later.
   AudioDevice();
-
-  AudioDevice(const media::AudioParameters& params, RenderCallback* callback);
+  explicit AudioDevice(AudioMessageFilter* filter);

[Chris Rogers, 2012/06/25 20:05:17]

I wouldn't mind making this constructor (taking the filter) private, then making
the test be a friend.

[henrika (OOO until Aug 14), 2012/06/26 11:17:27]

Good comment. Given that I have not added a unit test in this CL, we might as
well remove this method for now and add it when a unit test is written instead.

 
   // AudioRendererSink implementation.
   virtual void Initialize(const media::AudioParameters& params,