Initial browser-side implementation for touch-action

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 ecc12056729c1ec58ffeea36e929288e7f08c5ca..4ea8be040660bc364ef6beabb4e1840b92b0ef5a 100644
--- a/content/browser/renderer_host/input/touch_event_queue.cc
+++ b/content/browser/renderer_host/input/touch_event_queue.cc
@@ -201,6 +201,16 @@ void TouchEventQueue::FlushQueue() {
                           ui::LatencyInfo());
 }
 
+bool TouchEventQueue::IsPendingAckTouchStart() const {
+  DCHECK(!dispatching_touch_ack_);
+  if (touch_queue_.empty())
+    return false;
+
+  const blink::WebTouchEvent& event =
+      touch_queue_.front()->coalesced_event().event;
+  return (event.type == blink::WebInputEvent::TouchStart);
+}
+
 size_t TouchEventQueue::GetQueueSize() const {
   return touch_queue_.size();
 }