A thread safe CSS calc parser for sizes

Source/core/css/MediaValuesDynamic.h

 // 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.
 
 #ifndef MediaValuesDynamic_h
 #define MediaValuesDynamic_h
 
 #include "core/css/MediaValues.h"
 
 namespace WebCore {
 
 class Document;
 
 class MediaValuesDynamic FINAL : public MediaValues {
 public:
     static PassRefPtr<MediaValues> create(LocalFrame*);
     virtual PassRefPtr<MediaValues> copy() const OVERRIDE;
     virtual bool isSafeToSendToAnotherThread() const OVERRIDE;
     virtual bool computeLength(double value, CSSPrimitiveValue::UnitTypes, int& result) const OVERRIDE;
+    virtual bool computeLength(double value, CSSPrimitiveValue::UnitTypes, double& result) const OVERRIDE;
 
     virtual int viewportWidth() const OVERRIDE;
     virtual int viewportHeight() const OVERRIDE;
     virtual int deviceWidth() const OVERRIDE;
     virtual int deviceHeight() const OVERRIDE;
     virtual float devicePixelRatio() const OVERRIDE;
     virtual int colorBitsPerComponent() const OVERRIDE;
     virtual int monochromeBitsPerComponent() const OVERRIDE;
     virtual PointerDeviceType pointer() const OVERRIDE;
     virtual bool threeDEnabled() const OVERRIDE;
     virtual bool scanMediaType() const OVERRIDE;
     virtual bool screenMediaType() const OVERRIDE;
     virtual bool printMediaType() const OVERRIDE;
     virtual bool strictMode() const OVERRIDE;
     virtual Document* document() const OVERRIDE;
     virtual bool hasValues() const OVERRIDE;
 
 protected:
     MediaValuesDynamic(LocalFrame*);
 
     // This raw ptr is safe, as MediaValues would not outlive MediaQueryEvaluator, and
     // MediaQueryEvaluator is reset on |Document::detach|.
     // FIXME: Oilpan: This raw ptr should be changed to a Member when LocalFrame is migrated to the heap.
     LocalFrame* m_frame;
 };
 
 } // namespace
 
 #endif // MediaValuesDynamic_h