Revert of MediaStream audio: Refactor 3 separate "glue" implementations into one.

content/renderer/pepper/pepper_media_stream_video_track_host.h

Index: content/renderer/pepper/pepper_media_stream_video_track_host.h
diff --git a/content/renderer/pepper/pepper_media_stream_video_track_host.h b/content/renderer/pepper/pepper_media_stream_video_track_host.h
index e4e603c43cd3cdf60373d9ab71963e844cb94834..b510377001ceb21ae3de00bbc76d9e436fd7a8ea 100644
--- a/content/renderer/pepper/pepper_media_stream_video_track_host.h
+++ b/content/renderer/pepper/pepper_media_stream_video_track_host.h
@@ -10,8 +10,8 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "content/public/common/media_stream_request.h"
 #include "content/public/renderer/media_stream_video_sink.h"
+#include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
 #include "media/base/video_frame.h"
 #include "ppapi/c/ppb_video_frame.h"
@@ -21,10 +21,9 @@
 
 namespace content {
 
-class MediaStreamSource;
-
 class PepperMediaStreamVideoTrackHost : public PepperMediaStreamTrackHostBase,
-                                        public MediaStreamVideoSink {
+                                        public MediaStreamVideoSink,
+                                        public MediaStreamVideoSource {
  public:
   // Input mode constructor.
   // In input mode, this class passes video frames from |track| to the
@@ -48,11 +47,6 @@
   blink::WebMediaStreamTrack track() { return track_; }
 
  private:
-  // Implements a MediaStreamVideoSource that drives this host (output mode
-  // only). VideoSource holds a weak reference to the host, and sets/clears
-  // |frame_deliverer_|.
-  class VideoSource;
-
   void InitBuffers();
 
   // PepperMediaStreamTrackHostBase overrides:
@@ -65,6 +59,20 @@
 
   void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
                     base::TimeTicks estimated_capture_time);
+
+  // MediaStreamVideoSource overrides:
+  void GetCurrentSupportedFormats(
+      int max_requested_width,
+      int max_requested_height,
+      double max_requested_frame_rate,
+      const VideoCaptureDeviceFormatsCB& callback) override;
+
+  void StartSourceImpl(
+      const media::VideoCaptureFormat& format,
+      const blink::WebMediaConstraints& constraints,
+      const VideoCaptureDeliverFrameCB& frame_callback) override;
+
+  void StopSourceImpl() override;
 
   // ResourceHost overrides:
   void DidConnectPendingHostToResource() override;
@@ -107,6 +115,7 @@
   // TODO(ronghuawu): Remove |type_| and split PepperMediaStreamVideoTrackHost
   // into 2 classes for read and write.
   TrackType type_;
+  bool output_started_;
 
   // Internal class used for delivering video frames on the IO-thread to
   // the MediaStreamVideoSource implementation.