Linux Video Capture: Add V4L2VideoCaptureDelegate{Single,Multi}Plane.

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 94cbac24fdf69fb4fd7a63e92eff687c1bb056d5..8e71e57da7e408a3a85c5b93d15c1befd457e87f 100644
--- a/media/video/capture/linux/video_capture_device_linux.h
+++ b/media/video/capture/linux/video_capture_device_linux.h
@@ -20,11 +20,14 @@
 
 namespace media {
 
+class V4L2VideoCaptureDelegate;
+
 // Linux V4L2 implementation of VideoCaptureDevice.
 class VideoCaptureDeviceLinux : public VideoCaptureDevice {
  public:
   static VideoPixelFormat V4l2FourCcToChromiumPixelFormat(uint32 v4l2_fourcc);
-  static std::list<int> GetListOfUsableFourCCs(bool favour_mjpeg);
+  static std::list<uint32_t> GetListOfUsableFourCCs(bool favour_mjpeg);
+  static int TranslatePowerLineFrequencyToV4L2(int frequency);
 
   explicit VideoCaptureDeviceLinux(const Name& device_name);
   ~VideoCaptureDeviceLinux() override;
@@ -41,8 +44,7 @@ class VideoCaptureDeviceLinux : public VideoCaptureDevice {
   // Internal delegate doing the actual capture setting, buffer allocation and
   // circulacion with the V4L2 API. Created and deleted in the thread where
   // VideoCaptureDeviceLinux lives but otherwise operating on |v4l2_thread_|.
-  class V4L2CaptureDelegate;
-  scoped_refptr<V4L2CaptureDelegate> capture_impl_;
+  scoped_refptr<V4L2VideoCaptureDelegate> capture_impl_;
 
   base::Thread v4l2_thread_;  // Thread used for reading data from the device.