Initial browser-side implementation for touch-action

content/browser/renderer_host/input/touch_event_queue.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/input/touch_event_queue.h"
 
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "base/stl_util.h"
 
@@ skipping 183 matching lines @@
   }
 }
 
 void TouchEventQueue::FlushQueue() {
   DCHECK(!dispatching_touch_ack_);
   while (!touch_queue_.empty())
     PopTouchEventToClient(INPUT_EVENT_ACK_STATE_NOT_CONSUMED,
                           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();
 }
 
 const TouchEventWithLatencyInfo& TouchEventQueue::GetLatestEvent() const {
   return touch_queue_.back()->coalesced_event();
 }
 
 void TouchEventQueue::PopTouchEventToClient(
     InputEventAckState ack_result,
@@ skipping 43 matching lines @@
       // If the ACK status of a point is unknown, then the event should be
       // forwarded to the renderer.
       return true;
     }
   }
 
   return false;
 }
 
 }  // namespace content