Implement CSSPaintValue and add a layout test.

third_party/WebKit/Source/core/css/CSSVariableData.h

 // Copyright 2015 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.
 
 #ifndef CSSVariableData_h
 #define CSSVariableData_h
 
 #include "core/css/StylePropertySet.h"
 #include "core/css/parser/CSSParserToken.h"
 #include "core/css/parser/CSSParserTokenRange.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class CSSParserTokenRange;
 class CSSSyntaxDescriptor;
 
-class CSSVariableData : public RefCounted<CSSVariableData> {
+class CORE_EXPORT CSSVariableData : public RefCounted<CSSVariableData> {
   WTF_MAKE_NONCOPYABLE(CSSVariableData);
   USING_FAST_MALLOC(CSSVariableData);
 
  public:
   static PassRefPtr<CSSVariableData> create(const CSSParserTokenRange& range,
                                             bool isAnimationTainted,
                                             bool needsVariableResolution) {
     return adoptRef(new CSSVariableData(range, isAnimationTainted,
                                         needsVariableResolution));
   }
@@ skipping 49 matching lines @@
   const bool m_needsVariableResolution;
 
   // Parsed representation for @apply
   bool m_cachedPropertySet;
   Persistent<StylePropertySet> m_propertySet;
 };
 
 }  // namespace blink
 
 #endif  // CSSVariableData_h