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

media/video/capture/linux/video_capture_device_linux.h

Index: media/video/capture/linux/video_capture_device_linux.h
diff --git a/media/video/capture/linux/video_capture_device_linux.h b/media/video/capture/linux/video_capture_device_linux.h
index dc35fd452ca570c17bc65e915f253d10af7f2a68..f57c3068f26e2f8811bf64785078f5167a04ea95 100644
--- a/media/video/capture/linux/video_capture_device_linux.h
+++ b/media/video/capture/linux/video_capture_device_linux.h
@@ -30,6 +30,9 @@ class VideoCaptureDeviceLinux : public VideoCaptureDevice {
   virtual void Stop() OVERRIDE;
   virtual void DeAllocate() OVERRIDE;
   virtual const Name& device_name() OVERRIDE;
+  virtual void GetDeviceSupportedFormats(
+      const std::string& device_name,
+      VideoCaptureFormats* capture_formats) OVERRIDE;
 
  private:
   enum InternalState {