Convert synthesized Android motion events to long and not to int. (flutter#6103)

Author: amirh

shell/platform/android/io/flutter/plugin/platform/PlatformViewsController.java

@@ -254,8 +254,8 @@ private void onTouch(MethodCall call, MethodChannel.Result result) {
         }
 
         MotionEvent event = MotionEvent.obtain(
-                downTime.intValue(),
-                eventTime.intValue(),
+                downTime.longValue(),
+                eventTime.longValue(),
                 action,
                 pointerCount,
                 pointerProperties,