Add a ChromeOS implementation of VideoCaptureDevice

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 303da310be2706ab0a8c299516afaef2c4575afd..5415eb744d996f06159862a6ef04bc6093eb53f0 100644
--- a/media/video/capture/linux/video_capture_device_linux.h
+++ b/media/video/capture/linux/video_capture_device_linux.h
@@ -35,6 +35,12 @@ class VideoCaptureDeviceLinux : public VideoCaptureDevice {
 
   virtual void StopAndDeAllocate() OVERRIDE;
 
+ protected:
+  void SetRotation(int rotation);
+
+  // Once |v4l2_thread_| is started, only called on that thread.
+  void SetRotationOnV4L2Thread(int rotation);
+
  private:
   enum InternalState {
     kIdle,  // The device driver is opened but camera is not in use.
@@ -72,6 +78,11 @@ class VideoCaptureDeviceLinux : public VideoCaptureDevice {
   int timeout_count_;
   VideoCaptureFormat capture_format_;
 
+  // Clockwise rotation in degrees.  This value should be 0, 90, 180, or 270.
+  // This is only used on |v4l2_thread_| when it is running, or the constructor
+  // thread otherwise.
+  int rotation_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux);
 };