Add fillRule option for hit regions on canvas2d.

Source/core/html/canvas/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 "config.h"
 #include "core/html/canvas/HitRegion.h"
 
 #include "core/accessibility/AXObjectCache.h"
 #include "core/rendering/RenderBoxModelObject.h"
 
 namespace WebCore {
 
 HitRegion::HitRegion(const HitRegionOptions& options)
     : m_id(options.id)
     , m_control(options.control)
     , m_path(options.path)
+    , m_fillRule(options.fillRule)
 {
 }
 
 void HitRegion::updateAccessibility(Element* canvas)
 {
     if (!m_control || !canvas || !canvas->renderer() || !m_control->isDescendantOf(canvas))
         return;
 
     AXObjectCache* axObjectCache = m_control->document().existingAXObjectCache();
     if (!axObjectCache)
         return;
 
     FloatRect boundingRect = m_path.boundingRect();
 
     // Offset by the canvas rect, taking border and padding into account.
     RenderBoxModelObject* rbmo = canvas->renderBoxModelObject();
     IntRect canvasRect = canvas->renderer()->absoluteBoundingBoxRect();
     canvasRect.move(rbmo->borderLeft() + rbmo->paddingLeft(),
         rbmo->borderTop() + rbmo->paddingTop());
     LayoutRect elementRect = enclosingLayoutRect(boundingRect);
     elementRect.moveBy(canvasRect.location());
 
     axObjectCache->setCanvasObjectBounds(m_control.get(), elementRect);
 }
 
 bool HitRegion::contains(const LayoutPoint& point) const
 {
-    return m_path.contains(point, RULE_NONZERO);
+    return m_path.contains(point, m_fillRule);
 }
 
 void HitRegion::removePixels(const Path& clearArea)
 {
     m_path.subtractPath(clearArea);
 }
 
 void HitRegion::trace(Visitor* visitor)
 {
     visitor->trace(m_control);
@@ skipping 99 matching lines @@
 void HitRegionManager::trace(Visitor* visitor)
 {
     visitor->trace(m_hitRegionList);
     visitor->trace(m_hitRegionIdMap);
     visitor->trace(m_hitRegionControlMap);
 }
 
 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(HitRegionManager)
 
 } // namespace WebCore