Chrome allows WebTouchPoint to store WebFloatPoint, instead of WebPoint.

content/renderer/render_widget.cc

 // Copyright (c) 2012 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/renderer/render_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/debug/trace_event_synthetic_delay.h"
@@ skipping 1122 matching lines @@
       INPUT_EVENT_ACK_STATE_CONSUMED : INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
   if (!processed &&  input_event->type == WebInputEvent::TouchStart) {
     const WebTouchEvent& touch_event =
         *static_cast<const WebTouchEvent*>(input_event);
     // Hit-test for all the pressed touch points. If there is a touch-handler
     // for any of the touch points, then the renderer should continue to receive
     // touch events.
     ack_result = INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS;
     for (size_t i = 0; i < touch_event.touchesLength; ++i) {
       if (touch_event.touches[i].state == WebTouchPoint::StatePressed &&
-          HasTouchEventHandlersAt(touch_event.touches[i].position)) {
+          HasTouchEventHandlersAt(
+              blink::WebPoint(touch_event.touches[i].position.x,
+                              touch_event.touches[i].position.y))) {
         ack_result = INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
         break;
       }
     }
   }
 
   bool event_type_can_be_rate_limited =
       input_event->type == WebInputEvent::MouseMove ||
       input_event->type == WebInputEvent::MouseWheel ||
       input_event->type == WebInputEvent::TouchMove;
@@ skipping 1743 matching lines @@
 
 void RenderWidget::RegisterSwappedOutChildFrame(RenderFrameImpl* frame) {
   swapped_out_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterSwappedOutChildFrame(RenderFrameImpl* frame) {
   swapped_out_frames_.RemoveObserver(frame);
 }
 
 }  // namespace content