Make first TouchStart and first TouchMove events on a flinging layer non-blocking

content/browser/renderer_host/input/touch_event_queue.cc

Index: content/browser/renderer_host/input/touch_event_queue.cc
diff --git a/content/browser/renderer_host/input/touch_event_queue.cc b/content/browser/renderer_host/input/touch_event_queue.cc
index 817815ac9a145f940905a1e62dd071b9fd71e510..701f4fde7fe7e88a6bc5febfeb41b2ecdb277d5a 100644
--- a/content/browser/renderer_host/input/touch_event_queue.cc
+++ b/content/browser/renderer_host/input/touch_event_queue.cc
@@ -792,10 +792,15 @@ void TouchEventQueue::SendTouchEventImmediately(
   if (dispatching_touch_)
     return;
 
+  if (touch->event.type == WebInputEvent::TouchStart)
+    touch->event.touchStartOrFirstTouchMove = true;
+
   // For touchmove events, compare touch points position from current event
   // to last sent event and update touch points state.
   if (touch->event.type == WebInputEvent::TouchMove) {
     CHECK(last_sent_touchevent_);
+    if (last_sent_touchevent_->type == WebInputEvent::TouchStart)
+      touch->event.touchStartOrFirstTouchMove = true;
     for (unsigned int i = 0; i < last_sent_touchevent_->touchesLength; ++i) {
       const WebTouchPoint& last_touch_point =
           last_sent_touchevent_->touches[i];