Implement MediaValues for initial viewport.

third_party/WebKit/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 blink {
 
 class Document;
 
-class MediaValuesDynamic final : public MediaValues {
+class CORE_EXPORT MediaValuesDynamic : public MediaValues {
  public:
   static MediaValues* create(Document&);
   static MediaValues* create(LocalFrame*);
   MediaValues* copy() const override;
   bool computeLength(double value,
                      CSSPrimitiveValue::UnitType,
                      int& result) const override;
   bool computeLength(double value,
                      CSSPrimitiveValue::UnitType,
                      double& result) const override;
@@ skipping 30 matching lines @@
   // and MediaQueryEvaluator is reset on |Document::detachLayoutTree|.
   Member<LocalFrame> m_frame;
   bool m_viewportDimensionsOverridden;
   double m_viewportWidthOverride;
   double m_viewportHeightOverride;
 };
 
 }  // namespace blink
 
 #endif  // MediaValuesDynamic_h