Add CSS support for font-variation-settings

third_party/WebKit/Source/core/css/CSSFontVariationValue.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/css/CSSFontVariationValue.h"
+
+#include "wtf/text/StringBuilder.h"
+
+namespace blink {
+
+CSSFontVariationValue::CSSFontVariationValue(const AtomicString& tag,
+                                             float value)
+    : CSSValue(FontVariationClass), m_tag(tag), m_value(value) {}
+
+String CSSFontVariationValue::customCSSText() const {
+  StringBuilder builder;
+  builder.append('\'');
+  builder.append(m_tag);
+  builder.append("' ");
+  builder.appendNumber(m_value);
+  return builder.toString();
+}
+
+bool CSSFontVariationValue::equals(const CSSFontVariationValue& other) const {
+  return m_tag == other.m_tag && m_value == other.m_value;
+}
+
+}  // namespace blink