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 33717901cd1cc395dbeab6e67565624e96b98d6b..e08e9fab30b72bd2098179715a2e588810b0374f 100644
--- a/content/browser/renderer_host/input/touch_event_queue.cc
+++ b/content/browser/renderer_host/input/touch_event_queue.cc
@@ -201,6 +201,25 @@ void TouchEventQueue::FlushQueue() {
                           ui::LatencyInfo());
 }
 
+bool TouchEventQueue::IsTouchStartPendingAck(int touch_id)
+{
+  if (touch_queue_.empty())
+    return false;
+
+  const WebKit::WebTouchEvent& event =
+      touch_queue_.front()->coalesced_event().event;
+  if (event.type == WebKit::WebInputEvent::TouchStart) {
+    for (unsigned i = 0; i < event.touchesLength; ++i) {
+      const WebKit::WebTouchPoint& point = event.touches[i];
+      if (point.state == WebKit::WebTouchPoint::StatePressed &&
+          point.id == touch_id)
+        return true;
+    }
+  }
+
+  return false;
+}
+
 size_t TouchEventQueue::GetQueueSize() const {
   return touch_queue_.size();
 }