Align format of touch events with Paper

Summary:
Changelog: [internal]

Touch events should be of a type PressEvent. Fabric only provided touches, changedTouches and targetTouches and leaves out force, identifier, locationX, locationY, pageX, pageY and timestamp.

Reviewed By: shergin

Differential Revision: D25243347

fbshipit-source-id: e824558bd43f51c0c6dcca62bfc98318aa61678e

ReactCommon/react/renderer/components/view/TouchEventEmitter.cpp

@@ -12,8 +12,10 @@ namespace react {
 
 #pragma mark - Touches
 
-static jsi::Value touchPayload(jsi::Runtime &runtime, Touch const &touch) {
-  auto object = jsi::Object(runtime);
+static void setTouchPayloadOnObject(
+    jsi::Object &object,
+    jsi::Runtime &runtime,
+    Touch const &touch) {
   object.setProperty(runtime, "locationX", touch.offsetPoint.x);
   object.setProperty(runtime, "locationY", touch.offsetPoint.y);
   object.setProperty(runtime, "pageX", touch.pagePoint.x);
@@ -24,7 +26,6 @@ static jsi::Value touchPayload(jsi::Runtime &runtime, Touch const &touch) {
   object.setProperty(runtime, "target", touch.target);
   object.setProperty(runtime, "timestamp", touch.timestamp * 1000);
   object.setProperty(runtime, "force", touch.force);
-  return object;
 }
 
 static jsi::Value touchesPayload(
@@ -33,7 +34,9 @@ static jsi::Value touchesPayload(
   auto array = jsi::Array(runtime, touches.size());
   int i = 0;
   for (auto const &touch : touches) {
-    array.setValueAtIndex(runtime, i++, touchPayload(runtime, touch));
+    auto object = jsi::Object(runtime);
+    setTouchPayloadOnObject(object, runtime, touch);
+    array.setValueAtIndex(runtime, i++, object);
   }
   return array;
 }
@@ -48,6 +51,11 @@ static jsi::Value touchEventPayload(
       runtime, "changedTouches", touchesPayload(runtime, event.changedTouches));
   object.setProperty(
       runtime, "targetTouches", touchesPayload(runtime, event.targetTouches));
+
+  if (!event.changedTouches.empty()) {
+    auto const &firstChangedTouch = *event.changedTouches.begin();
+    setTouchPayloadOnObject(object, runtime, firstChangedTouch);
+  }
   return object;
 }