Add <meta viewport> support to the preloader

Source/core/css/MediaValues.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 MediaValues_h
 #define MediaValues_h
 
 #include "core/CoreExport.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/PointerProperties.h"
 #include "public/platform/WebDisplayMode.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class Document;
 class CSSPrimitiveValue;
 class LocalFrame;
 
 class CORE_EXPORT MediaValues : public RefCounted<MediaValues> {
 public:
 
-    enum MediaValuesMode {
-        CachingMode,
-        DynamicMode
-    };
-
     virtual ~MediaValues() { }
 
     static PassRefPtr<MediaValues> createDynamicIfFrameExists(LocalFrame*);
     virtual PassRefPtr<MediaValues> copy() const = 0;
     virtual bool isSafeToSendToAnotherThread() const = 0;
 
     static bool computeLengthImpl(double value, CSSPrimitiveValue::UnitType, unsigned defaultFontSize, unsigned viewportWidth, unsigned viewportHeight, double& result);
     template<typename T>
     static bool computeLength(double value, CSSPrimitiveValue::UnitType type, unsigned defaultFontSize, unsigned viewportWidth, unsigned viewportHeight, T& result)
     {
@@ skipping 17 matching lines @@
     virtual int availablePointerTypes() const = 0;
     virtual HoverType primaryHoverType() const = 0;
     virtual int availableHoverTypes() const = 0;
     virtual bool threeDEnabled() const = 0;
     virtual const String mediaType() const = 0;
     virtual WebDisplayMode displayMode() const = 0;
     virtual bool strictMode() const = 0;
     virtual Document* document() const = 0;
     virtual bool hasValues() const = 0;
 
+    virtual bool isCached() const { return false; }
+
 protected:
     int calculateViewportWidth(LocalFrame*) const;
     int calculateViewportHeight(LocalFrame*) const;
     int calculateDeviceWidth(LocalFrame*) const;
     int calculateDeviceHeight(LocalFrame*) const;
     bool calculateStrictMode(LocalFrame*) const;
     float calculateDevicePixelRatio(LocalFrame*) const;
     int calculateColorBitsPerComponent(LocalFrame*) const;
     int calculateMonochromeBitsPerComponent(LocalFrame*) const;
     int calculateDefaultFontSize(LocalFrame*) const;
     const String calculateMediaType(LocalFrame*) const;
     WebDisplayMode calculateDisplayMode(LocalFrame*) const;
     bool calculateThreeDEnabled(LocalFrame*) const;
     PointerType calculatePrimaryPointerType(LocalFrame*) const;
     int calculateAvailablePointerTypes(LocalFrame*) const;
     HoverType calculatePrimaryHoverType(LocalFrame*) const;
     int calculateAvailableHoverTypes(LocalFrame*) const;
     static LocalFrame* frameFrom(Document&);
 
 };
 
 } // namespace
 
 #endif // MediaValues_h