Add VideoCaptureDevice::GetDeviceSupportedFormats to interface + implementation for Linux and Fake

media/video/capture/video_capture_types.h

Index: media/video/capture/video_capture_types.h
diff --git a/media/video/capture/video_capture_types.h b/media/video/capture/video_capture_types.h
index 1a170aaf5e7d623b102f96020d5805d04aab1680..a1246c5ca553fd3981fa2471524853032c3cc704 100644
--- a/media/video/capture/video_capture_types.h
+++ b/media/video/capture/video_capture_types.h
@@ -55,7 +55,7 @@ class MEDIA_EXPORT VideoCaptureFormat {
 class MEDIA_EXPORT VideoCaptureParams : public VideoCaptureFormat {
  public:
   VideoCaptureParams();
-
+  // TODO(mcasas): http://crbug.com/297597, investigate if session_id is in use.
   VideoCaptureSessionId session_id;
 };
 
@@ -72,11 +72,15 @@ class MEDIA_EXPORT VideoCaptureCapability : public VideoCaptureFormat {
                          VideoCaptureResolutionType frame_size_type);
 
   VideoPixelFormat color;      // Desired video type.
+  // TODO(mcasas): http://crbug.com/297597, investigate if the following three
+  // attributes are in use at all.
   int expected_capture_delay;  // Expected delay in millisecond.
   bool interlaced;             // Need interlace format.
   VideoCaptureSessionId session_id;
 };
 
+typedef std::vector<VideoCaptureCapability> VideoCaptureFormats;
+
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_TYPES_H_