Added support for Android video textures

include/SDL_pixels.h

@@ -287,7 +287,9 @@ enum
     SDL_PIXELFORMAT_NV12 =      /**< Planar mode: Y + U/V interleaved  (2 planes) */
         SDL_DEFINE_PIXELFOURCC('N', 'V', '1', '2'),
     SDL_PIXELFORMAT_NV21 =      /**< Planar mode: Y + V/U interleaved  (2 planes) */
-        SDL_DEFINE_PIXELFOURCC('N', 'V', '2', '1')
+        SDL_DEFINE_PIXELFOURCC('N', 'V', '2', '1'),
+    SDL_PIXELFORMAT_EXTERNAL_OES =      /**< Android video texture format */
+        SDL_DEFINE_PIXELFOURCC('O', 'E', 'S', ' ')
 };
 
 typedef struct SDL_Color