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::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();
 }
 
 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