Factor painting code from RenderBlock into BlockPainter.

Source/core/paint/BlockPainter.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 BlockPainter_h
+#define BlockPainter_h
+
+#include "core/rendering/RenderBlock.h"
+
+namespace blink {
+
+struct PaintInfo;
+class LayoutPoint;
+
+class BlockPainter {
+public:
+    BlockPainter(RenderBlock& block) : m_renderBlock(block) { }
+
+    void paint(PaintInfo&, const LayoutPoint& paintOffset);
+    void paintObject(PaintInfo&, const LayoutPoint&);
+    void paintChildren(PaintInfo&, const LayoutPoint&);
+    void paintChildAsInlineBlock(RenderBox*, PaintInfo&, const LayoutPoint&);
+
+    // inline-block elements paint all phases atomically. This function ensures that. Certain other elements
+    // (grid items, flex items) require this behavior as well, and this function exists as a helper for them.
+    // It is expected that the caller will call this function independent of the value of paintInfo.phase.
+    static void paintAsInlineBlock(RenderObject*, PaintInfo&, const LayoutPoint&);
+
+private:
+    LayoutRect overflowRectForPaintRejection() const;
+    bool hasCaret() const;
+    void paintCarets(PaintInfo&, const LayoutPoint&);
+    void paintContents(PaintInfo&, const LayoutPoint&);
+    void paintColumnContents(PaintInfo&, const LayoutPoint&, bool paintFloats = false);
+    void paintColumnRules(PaintInfo&, const LayoutPoint&);
+    void paintChild(RenderBox*, PaintInfo&, const LayoutPoint&);
+    void paintSelection(PaintInfo&, const LayoutPoint&);
+    void paintContinuationOutlines(PaintInfo&, const LayoutPoint&);
+
+    RenderBlock& m_renderBlock;
+};
+
+} // namespace blink
+
+#endif // BlockPainter_h