Canvas2d: fix event.region being null on mouseleave/out events

third_party/WebKit/Source/modules/canvas2d/HitRegion.cpp

 // Copyright 2014 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 "modules/canvas2d/HitRegion.h"
 
 #include "core/dom/AXObjectCache.h"
 #include "core/layout/LayoutBoxModelObject.h"
 
 namespace blink {
@@ skipping 48 matching lines @@
 
     m_hitRegionList.remove(hitRegion);
 }
 
 void HitRegionManager::removeHitRegionById(const String& id)
 {
     if (!id.isEmpty())
         removeHitRegion(getHitRegionById(id));
 }
 
-void HitRegionManager::removeHitRegionByControl(Element* control)
+void HitRegionManager::removeHitRegionByControl(const Element* control)
 {
     removeHitRegion(getHitRegionByControl(control));
 }
 
 void HitRegionManager::removeHitRegionsInRect(const FloatRect& rect, const AffineTransform& ctm)
 {
     Path clearArea;
     clearArea.addRect(rect);
     clearArea.transform(ctm);
 
@@ skipping 17 matching lines @@
     m_hitRegionList.clear();
     m_hitRegionIdMap.clear();
     m_hitRegionControlMap.clear();
 }
 
 HitRegion* HitRegionManager::getHitRegionById(const String& id) const
 {
     return m_hitRegionIdMap.get(id);
 }
 
-HitRegion* HitRegionManager::getHitRegionByControl(Element* control) const
+HitRegion* HitRegionManager::getHitRegionByControl(const Element* control) const
 {
     if (control)
         return m_hitRegionControlMap.get(control);
 
     return nullptr;
 }
 
 HitRegion* HitRegionManager::getHitRegionAtPoint(const FloatPoint& point) const
 {
     HitRegionIterator itEnd = m_hitRegionList.rend();
@@ skipping 13 matching lines @@
 }
 
 DEFINE_TRACE(HitRegionManager)
 {
     visitor->trace(m_hitRegionList);
     visitor->trace(m_hitRegionIdMap);
     visitor->trace(m_hitRegionControlMap);
 }
 
 } // namespace blink