Add StylePath and use it to store 'd' in ComputedStyle

third_party/WebKit/Source/core/style/StylePath.cpp

+// Copyright 2016 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 "core/style/StylePath.h"
+
+#include "core/css/CSSPathValue.h"
+#include "core/svg/SVGPathByteStream.h"
+#include "core/svg/SVGPathUtilities.h"
+
+namespace blink {
+
+StylePath::StylePath(PassRefPtr<SVGPathByteStream> pathByteStream)
+    : m_byteStream(pathByteStream)
+{
+    ASSERT(m_byteStream);
+    buildPathFromByteStream(*m_byteStream, m_path);
+}
+
+StylePath::~StylePath()
+{
+}
+
+PassRefPtr<StylePath> StylePath::create(PassRefPtr<SVGPathByteStream> pathByteStream)
+{
+    return adoptRef(new StylePath(pathByteStream));
+}
+
+StylePath* StylePath::emptyPath()
+{
+    DEFINE_STATIC_REF(StylePath, emptyPath, StylePath::create(SVGPathByteStream::create()));
+    return emptyPath;
+}
+
+const SVGPathByteStream& StylePath::byteStream() const
+{
+    return *m_byteStream;
+}
+
+PassRefPtrWillBeRawPtr<CSSValue> StylePath::computedCSSValue() const
+{
+    return CSSPathValue::create(m_byteStream, const_cast<StylePath*>(this));
+}
+
+bool StylePath::equals(const StylePath& other) const
+{
+    return *m_byteStream == *other.m_byteStream;
+}
+
+} // namespace blink