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 {
+  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();
 }
 
 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