[tvOS] Implement a default behaviour of ASImageNode, trying to match the behaviour of UIImageView. Still need to add shine.

AsyncDisplayKit/ASControlNode.h

@@ -122,7 +122,12 @@ typedef NS_OPTIONS(NSUInteger, ASControlState) {
   @param event The event which triggered these control actions. May be nil.
  */
 - (void)sendActionsForControlEvents:(ASControlNodeEvent)controlEvents withEvent:(nullable UIEvent *)event;
-
+#if TARGET_OS_TV
+/**
+ @abstract How the node looks when it isn't focused. Exposed here so that subclasses can override.
+ */
+- (void)setDefaultState;
+#endif
 @end
 
 NS_ASSUME_NONNULL_END