RCTTouchEvent's init takes coalescing key

Reviewed By: javache

Differential Revision: D3092861

fb-gh-sync-id: 69beb58c0a2ca3fe33712a57098c8b7300ad49f4
fbshipit-source-id: 69beb58c0a2ca3fe33712a57098c8b7300ad49f4

React/Base/RCTTouchEvent.h

@@ -19,5 +19,6 @@
 
 - (instancetype)initWithEventName:(NSString *)eventName
                      reactTouches:(NSArray<NSDictionary *> *)reactTouches
-                   changedIndexes:(NSArray<NSNumber *> *)changedIndexes NS_DESIGNATED_INITIALIZER;
+                   changedIndexes:(NSArray<NSNumber *> *)changedIndexes
+                    coalescingKey:(uint16_t)coalescingKey NS_DESIGNATED_INITIALIZER;
 @end

React/Base/RCTTouchEvent.m

@@ -14,20 +14,22 @@
 {
   NSArray<NSDictionary *> *_reactTouches;
   NSArray<NSNumber *> *_changedIndexes;
+  uint16_t _coalescingKey;
 }
 
 @synthesize eventName = _eventName;
 @synthesize viewTag = _viewTag;
-@synthesize coalescingKey = _coalescingKey;
 
 - (instancetype)initWithEventName:(NSString *)eventName
                      reactTouches:(NSArray<NSDictionary *> *)reactTouches
                    changedIndexes:(NSArray<NSNumber *> *)changedIndexes
+                    coalescingKey:(uint16_t)coalescingKey
 {
   if (self = [super init]) {
     _eventName = eventName;
     _reactTouches = reactTouches;
     _changedIndexes = changedIndexes;
+    _coalescingKey = coalescingKey;
   }
   return self;
 }
@@ -75,4 +77,9 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
   return @[RCTNormalizeInputEventName(_eventName), _reactTouches, _changedIndexes];
 }
 
+- (uint16_t)coalescingKey
+{
+  return _coalescingKey;
+}
+
 @end

React/Base/RCTTouchHandler.m

@@ -199,7 +199,8 @@ typedef NS_ENUM(NSInteger, RCTTouchEventType) {
 
   RCTTouchEvent *event = [[RCTTouchEvent alloc] initWithEventName:eventName
                                                      reactTouches:reactTouches
-                                                   changedIndexes:changedIndexes];
+                                                   changedIndexes:changedIndexes
+                                                    coalescingKey:0];
   [_eventDispatcher sendEvent:event];
 }