Initial browser-side implementation for touch-action

content/browser/renderer_host/input/touch_event_queue.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EVENT_QUEUE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EVENT_QUEUE_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 44 matching lines @@
   // When GestureScrollBegin is received, we send a touch cancel to renderer,
   // route all the following touch events directly to client, and ignore the
   // ack for the touch cancel. When GestureScrollEnd/GestureFlingStart is
   // received, we resume the normal flow of sending touch events to renderer.
   void OnGestureScrollEvent(const GestureEventWithLatencyInfo& gesture_event);
 
   // Empties the queue of touch events. This may result in any number of gesture
   // events being sent to the renderer.
   void FlushQueue();
 
+  // Returns whether the currently pending touch event (waiting ACK) is for
+  // a touch start event.
+  bool IsPendingAckTouchStart() const;
+
   // Returns whether the event-queue is empty.
   bool empty() const WARN_UNUSED_RESULT {
     return touch_queue_.empty();
   }
 
   bool no_touch_to_renderer() const {
     return no_touch_to_renderer_;
   }
 
  private:
@@ skipping 33 matching lines @@
   // is scrolling. This behaviour is currently enabled only on aura behind
   // a flag.
   bool no_touch_to_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EVENT_QUEUE_H_