add ScrollResponder#scrollResponderZoomTo animated second argument

Summary:
ScrollResponder was missing a non animated version for zoomToRect.

- scrollResponderScrollTo <> scrollResponderScrollWithoutAnimationTo
- ~~scrollResponderZoomTo <> 🆕 **scrollResponderZoomWithoutAnimationTo**~~
- `scrollResponderZoomTo(rect, animated = true)`
Closes #5268

Reviewed By: svcscm

Differential Revision: D2823311

Pulled By: nicklockwood

fb-gh-sync-id: ea409d332963f56e8b58ec2c086db3f6815058f7

Libraries/Components/ScrollResponder.js

@@ -388,12 +388,13 @@ var ScrollResponderMixin = {
   /**
    * A helper function to zoom to a specific rect in the scrollview.
    * @param {object} rect Should have shape {x, y, width, height}
+   * @param {bool} animated Specify whether zoom is instant or animated
    */
-  scrollResponderZoomTo: function(rect: { x: number; y: number; width: number; height: number; }) {
+  scrollResponderZoomTo: function(rect: { x: number; y: number; width: number; height: number; }, animated: boolean = true) {
     if (Platform.OS === 'android') {
       invariant('zoomToRect is not implemented');
     } else {
-      ScrollViewManager.zoomToRect(React.findNodeHandle(this), rect);
+      ScrollViewManager.zoomToRect(React.findNodeHandle(this), rect, animated);
     }
   },
 

React/Views/RCTScrollViewManager.m

@@ -152,12 +152,12 @@ - (UIView *)view
     }];
 }
 
-RCT_EXPORT_METHOD(zoomToRect:(nonnull NSNumber *)reactTag withRect:(CGRect)rect)
+RCT_EXPORT_METHOD(zoomToRect:(nonnull NSNumber *)reactTag withRect:(CGRect)rect animated:(BOOL)animated)
 {
   [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, UIView *> *viewRegistry){
     UIView *view = viewRegistry[reactTag];
     if ([view conformsToProtocol:@protocol(RCTScrollableProtocol)]) {
-      [(id<RCTScrollableProtocol>)view zoomToRect:rect animated:YES];
+      [(id<RCTScrollableProtocol>)view zoomToRect:rect animated:animated];
     } else {
       RCTLogError(@"tried to zoomToRect: on non-RCTScrollableProtocol view %@ with tag #%@", view, reactTag);
     }