MXKRoomDataSource: Handle video thumbnail generation with MXKVideoThumbnailGenerator.

Riot/Modules/Room/DataSources/RoomDataSource.h

@@ -46,4 +46,20 @@
  */
 - (Widget *)jitsiWidget;
 
+/**
+ Send an video to the room.
+ Note: Move this method to MatrixKit when MatrixKit project will handle Swift module.
+ 
+ While sending, a fake event will be echoed in the messages list.
+ Once complete, this local echo will be replaced by the event saved by the homeserver.
+ 
+ @param videoLocalURL the local filesystem path of the video to send.
+ @param success A block object called when the operation succeeds. It returns
+ the event id of the event generated on the homeserver
+ @param failure A block object called when the operation fails.
+ */
+- (void)sendVideo:(NSURL*)videoLocalURL
+          success:(void (^)(NSString *eventId))success
+          failure:(void (^)(NSError *error))failure;
+
 @end