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..89319ee51a56e2f71f6c9f65f24e6eeeb457ba77 100644
--- a/content/browser/renderer_host/input/touch_event_queue.cc
+++ b/content/browser/renderer_host/input/touch_event_queue.cc
@@ -201,6 +201,15 @@ void TouchEventQueue::FlushQueue() {
                           ui::LatencyInfo());
 }
 
+bool TouchEventQueue::IsPendingAckTouchStart() const {
+  if (touch_queue_.empty())

[jdduke (slow), 2013/11/20 23:03:02]

Nit: Could you also DCHECK(!dispatching_touch_ack) here? In that case the head
of the queue is not actually pending an ack (with the current code that won't
ever be true but just to guard against future use of the public method).

[Rick Byers, 2013/11/21 02:37:36]

Done.

+    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();
 }