Relocate box border painting code into BoxBorderPainter

Source/core/paint/BoxBorderPainter.h

Index: Source/core/paint/BoxBorderPainter.h
diff --git a/Source/core/paint/BoxBorderPainter.h b/Source/core/paint/BoxBorderPainter.h
new file mode 100644
index 0000000000000000000000000000000000000000..2b9e435773095780babb38e35d8be6ae68295cc5
--- /dev/null
+++ b/Source/core/paint/BoxBorderPainter.h
@@ -0,0 +1,45 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.

[pdr., 2015/06/02 00:59:56]

Nit: Not your fault but line lengths are all over the place. Since we're moving
this, can you format the lines to be consistent? (Maybe in the de-static
followup)

[f(malita), 2015/06/02 01:12:53]

Agreed, will do. I tend to wrap at ~100 whatever I touch, but for this CL I
tried to minimize changes just in case anyone was actually trying to review :).

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BoxBorderPainter_h
+#define BoxBorderPainter_h
+
+#include "core/layout/LayoutBoxModelObject.h"
+#include "platform/heap/Heap.h"
+
+namespace blink {
+
+class ComputedStyle;
+class LayoutBox;
+class LayoutRect;
+struct PaintInfo;
+
+// TODO(fmalita): this class will evolve into a stateful painter (merged w/ BoxBorderInfo), with no
+// static methods.
+class BoxBorderPainter {
+    STACK_ALLOCATED();
+public:
+    void paintBorder(LayoutBoxModelObject&, const PaintInfo&, const LayoutRect&, const ComputedStyle&,
+        BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const;
+
+private:
+    static void paintTranslucentBorderSides(GraphicsContext*, const ComputedStyle&, const FloatRoundedRect& outerBorder, const FloatRoundedRect& innerBorder,
+        const BorderEdge[], BorderEdgeFlags, BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias = false);

[pdr., 2015/06/02 00:59:56]

The optional antialias value doesn't seem to be used.

[f(malita), 2015/06/02 01:12:53]

it's computed in paintBorder() & passed through to paintBorderSides().

[pdr., 2015/06/02 01:17:33]

I just mean the optional part: "bool antialias = false" -> "bool antialias".
This is only called with antialias values provided. Similarly for the others.

+    static void paintOneBorderSide(GraphicsContext*, const ComputedStyle&, const FloatRoundedRect& outerBorder, const FloatRoundedRect& innerBorder,

[pdr., 2015/06/02 00:59:56]

The optional overrideColor value doesn't seem to be used.

[f(malita), 2015/06/02 01:12:53]

computed in paintTranslucentBorderSides() & used for colorToPaint calculation.

+        const FloatRect& sideRect, BoxSide, BoxSide adjacentSide1, BoxSide adjacentSide2, const BorderEdge[],
+        const Path*, BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias, const Color* overrideColor = 0);
+    static void paintBorderSides(GraphicsContext*, const ComputedStyle&, const FloatRoundedRect& outerBorder, const FloatRoundedRect& innerBorder,

[pdr., 2015/06/02 00:59:56]

The optional antialias value doesn't seem to be used.

[f(malita), 2015/06/02 01:12:53]

ah, if only that was true... my sleep for the last few weeks would have been so
much better :)

(it's passed through to paintOneBorderSide())

+        const BorderEdge[], BorderEdgeFlags, BackgroundBleedAvoidance, bool includeLogicalLeftEdge,
+        bool includeLogicalRightEdge, bool antialias = false, const Color* overrideColor = 0);
+    static void drawBoxSideFromPath(GraphicsContext*, const LayoutRect&, const Path&, const BorderEdge[],
+        float thickness, float drawThickness, BoxSide, const ComputedStyle&,
+        Color, EBorderStyle, BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
+    static void clipBorderSidePolygon(GraphicsContext*, const FloatRoundedRect& outerBorder, const FloatRoundedRect& innerBorder,
+        BoxSide, bool firstEdgeMatches, bool secondEdgeMatches);
+    static void clipBorderSideForComplexInnerPath(GraphicsContext*, const FloatRoundedRect&, const FloatRoundedRect&, BoxSide, const BorderEdge[]);
+};
+
+} // namespace blink
+
+#endif