Move core/layout/style to core/style

Source/core/layout/style/BorderEdge.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 BorderEdge_h
-#define BorderEdge_h
-
-#include "core/layout/style/ComputedStyleConstants.h"
-#include "platform/graphics/Color.h"
-
-namespace blink {
-
-struct BorderEdge {
-    BorderEdge(int edgeWidth, const Color& edgeColor, EBorderStyle edgeStyle, bool edgeIsTransparent, bool edgeIsPresent = true);
-    BorderEdge();
-
-    bool hasVisibleColorAndStyle() const;
-    bool shouldRender() const;
-    bool presentButInvisible() const;
-    bool obscuresBackgroundEdge(float scale) const;
-    bool obscuresBackground() const;
-    int usedWidth() const;
-
-    void getDoubleBorderStripeWidths(int& outerWidth, int& innerWidth) const;
-
-    bool sharesColorWith(const BorderEdge& other) const;
-
-    EBorderStyle borderStyle() const  { return static_cast<EBorderStyle>(style); }
-
-    int width;
-    Color color;
-    bool isTransparent;
-    bool isPresent;
-
-private:
-    unsigned style: 4; // EBorderStyle
-};
-
-} // namespace blink
-
-#endif // BorderEdge_h