Refactor video capturing code in the render process

content/common/media/video_capture.h

Index: content/common/media/video_capture.h
diff --git a/content/common/media/video_capture.h b/content/common/media/video_capture.h
index 5c6384e19d0873ce3eadf87f003437529a7fb221..bf43ebbcda8ed39ff74a3239a983cc81e65f74b6 100644
--- a/content/common/media/video_capture.h
+++ b/content/common/media/video_capture.h
@@ -7,6 +7,10 @@
 #ifndef CONTENT_COMMON_MEDIA_VIDEO_CAPTURE_H_
 #define CONTENT_COMMON_MEDIA_VIDEO_CAPTURE_H_
 
+#include "base/time/time.h"
+#include "media/base/video_frame.h"
+#include "media/video/capture/video_capture_types.h"
+
 namespace content {
 
 // Current status of the video capture device. It's used by multiple classes
@@ -24,6 +28,15 @@ enum VideoCaptureState {
   VIDEO_CAPTURE_STATE_LAST = VIDEO_CAPTURE_STATE_ENDED
 };
 
+typedef base::Callback<void(VideoCaptureState)>
+    VideoCaptureStateUpdateCB;
+typedef base::Callback<void(const media::VideoCaptureFormats&)>
+    VideoCaptureDeviceFormatsCB;
+typedef base::Callback<
+  void(const scoped_refptr<media::VideoFrame>&,
+       const media::VideoCaptureFormat&)>
+    VideoCaptureDeliverFrameCB;
+
 }  // namespace content
 
 #endif  // CONTENT_COMMON_MEDIA_VIDEO_CAPTURE_H_