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

media/video/capture/video_capture_device_dummy.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A dummy implementation of VideoCaptureDevice to use for platforms without
 // real video capture support. The class will be removed once the other
 // platforms have real video capture device support.
 //
 // TODO(mflodman) Remove when video_capture_device_mac and
 // video_capture_device_win are available.
 
 #ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_DUMMY_H_
 #define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_DUMMY_H_
 
 #include "base/compiler_specific.h"
 #include "media/video/capture/video_capture_device.h"
 
 namespace media {
 
 class VideoCaptureDeviceDummy : public VideoCaptureDevice {
  public:
   virtual void Allocate(const VideoCaptureCapability& capture_format,
                          VideoCaptureDevice::EventHandler* observer) OVERRIDE;
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void DeAllocate() OVERRIDE;
+  virtual void GetDeviceSupportedFormats(
+      const std::string& device_name,
+      VideoCaptureFormats* capture_formats) OVERRIDE;
 
  private:
   VideoCaptureDeviceDummy();
   virtual ~VideoCaptureDeviceDummy();
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceDummy);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_DUMMY_H_