Adds filter support for offscreen canvas

third_party/WebKit/Source/core/css/resolver/StyleResolverState.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 11 matching lines @@
 #include "core/css/resolver/StyleResolverState.h"
 
 #include "core/animation/css/CSSAnimations.h"
 #include "core/css/StylePropertySet.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/frame/FrameHost.h"
 
 namespace blink {
 
+StyleResolverState::StyleResolverState(const ComputedStyle* parentStyle)
+    : m_document(nullptr)
+    , m_style(nullptr)
+    , m_parentStyle(const_cast<ComputedStyle*>(parentStyle))
+    , m_applyPropertyToRegularStyle(true)
+    , m_applyPropertyToVisitedLinkStyle(false)
+    , m_hasDirAutoAttribute(false)
+{
+}
+
 StyleResolverState::StyleResolverState(Document& document, const ElementResolveContext& elementContext, const ComputedStyle* parentStyle)
     : m_elementContext(elementContext)
     , m_document(document)
     , m_style(nullptr)
     // TODO(jchaffraix): We should make m_parentStyle const (https://crbug.com/468152)
     , m_parentStyle(const_cast<ComputedStyle*>(parentStyle))
     , m_applyPropertyToRegularStyle(true)
     , m_applyPropertyToVisitedLinkStyle(false)
     , m_hasDirAutoAttribute(false)
     , m_fontBuilder(document)
@@ skipping 48 matching lines @@
 {
     HeapHashMap<CSSPropertyID, Member<const CSSValue>>* map = m_parsedPropertiesForPendingSubstitution.get(&value);
     if (!map) {
         map = new HeapHashMap<CSSPropertyID, Member<const CSSValue>>;
         m_parsedPropertiesForPendingSubstitution.set(&value, map);
     }
     return *map;
 }
 
 } // namespace blink