Avoid rounding down viewport dimensions in Media Queries

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 {
 public:
     static PassRefPtrWillBeRawPtr<MediaValues> create(Document&);
     static PassRefPtrWillBeRawPtr<MediaValues> create(LocalFrame*);
     PassRefPtrWillBeRawPtr<MediaValues> copy() const override;
     bool isSafeToSendToAnotherThread() const override;
     bool computeLength(double value, CSSPrimitiveValue::UnitType, int& result) const override;
     bool computeLength(double value, CSSPrimitiveValue::UnitType, double& result) const override;
 
-    int viewportWidth() const override;
-    int viewportHeight() const override;
+    double viewportWidth() const override;
+    double viewportHeight() const override;
     int deviceWidth() const override;
     int deviceHeight() const override;
     float devicePixelRatio() const override;
     int colorBitsPerComponent() const override;
     int monochromeBitsPerComponent() const override;
     PointerType primaryPointerType() const override;
     int availablePointerTypes() const override;
     HoverType primaryHoverType() const override;
     int availableHoverTypes() const override;
     bool threeDEnabled() const override;
     bool strictMode() const override;
     const String mediaType() const override;
     WebDisplayMode displayMode() const override;
     Document* document() const override;
     bool hasValues() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     MediaValuesDynamic(LocalFrame*);
 
     // This raw ptr is safe, as MediaValues would not outlive MediaQueryEvaluator, and
     // MediaQueryEvaluator is reset on |Document::detach|.
     RawPtrWillBeMember<LocalFrame> m_frame;
 };
 
 } // namespace
 
 #endif // MediaValuesDynamic_h