Add an EGLImageKHR video node.

[ChangeLog] Added a VideoNode plugin which allows direct rendering of
EGLImageKHR backed video frames.

Change-Id: I36fb6fd27680dbe9c71a446bbd54df95488725f8
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

src/multimedia/video/qabstractvideobuffer.h

@@ -65,6 +65,7 @@ public:
         XvShmImageHandle,
         CoreImageHandle,
         QPixmapHandle,
+        EGLImageHandle,
         UserHandle = 1000
     };