Fix internal flow problems

Summary: D10013265 introduces flow types for `PanResponder`. This diff fixes the facebook-internal flow errors that surface as a result.

Reviewed By: TheSavior

Differential Revision: D10035046

fbshipit-source-id: fbba3d61e68851dda2da4f8e98238e0fdb35a27e

Libraries/Components/View/ViewPropTypes.js

@@ -146,6 +146,7 @@ type GestureResponderEventProps = $ReadOnly<{|
   onResponderRelease?: ?Function,
 
   onResponderStart?: ?Function,
+  onResponderEnd?: ?Function,
 
   /**
    * The responder has been taken from the `View`. Might be taken by other

Libraries/Interaction/PanResponder.js

@@ -555,4 +555,9 @@ function clearInteractionHandle(
   }
 }
 
+export type PanResponderInstance = $Call<
+  $PropertyType<typeof PanResponder, 'create'>,
+  PanResponderConfig,
+>;
+
 module.exports = PanResponder;

Libraries/Types/CoreEventTypes.js

@@ -19,7 +19,9 @@ export type SyntheticEvent<T> = $ReadOnly<{|
     registrationName: string,
   |}>,
   eventPhase: ?number,
+  preventDefault: () => void,
   isDefaultPrevented: () => boolean,
+  stopPropagation: () => void,
   isPropagationStopped: () => boolean,
   isTrusted: ?boolean,
   nativeEvent: T,