Make CanvasRenderingContext2D use SkCanvas directly

Source/core/html/canvas/ClipList.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/ClipList.h"
 
-#include "platform/graphics/GraphicsContext.h"
-#include "platform/graphics/Path.h"
 #include "platform/transforms/AffineTransform.h"
+#include "third_party/skia/include/core/SkCanvas.h"
 
 namespace blink {
 
 ClipList::ClipList(const ClipList& other) : m_clipList(other.m_clipList) { }
 
-void ClipList::clipPath(const Path& path, WindRule windRule, AntiAliasingMode antiAliasingMode, const AffineTransform& ctm)
+void ClipList::clipPath(const SkPath& path, AntiAliasingMode antiAliasingMode, const SkMatrix& ctm)
 {
     ClipOp newClip;
     newClip.m_antiAliasingMode = antiAliasingMode;
-    newClip.m_windRule = windRule;
     newClip.m_path = path;
     newClip.m_path.transform(ctm);
     m_clipList.append(newClip);
 }
 
-void ClipList::playback(GraphicsContext* context) const
+void ClipList::playback(SkCanvas* canvas) const
 {
     for (const ClipOp* it = m_clipList.begin(); it < m_clipList.end(); it++) {
-        context->clipPath(it->m_path, it->m_windRule, it->m_antiAliasingMode);
+        canvas->clipPath(it->m_path, SkRegion::kIntersect_Op, it->m_antiAliasingMode == AntiAliased);
     }
 }
 
 ClipList::ClipOp::ClipOp()
     : m_antiAliasingMode(AntiAliased)
-    , m_windRule(RULE_NONZERO)
 { }
 
 ClipList::ClipOp::ClipOp(const ClipOp& other)
     : m_path(other.m_path)
     , m_antiAliasingMode(other.m_antiAliasingMode)
-    , m_windRule(other.m_windRule)
 { }
 
 } // namespace blink