Move paint code from RenderBlockFlow into BlockFlowPainter.

Source/core/paint/BlockFlowPainter.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 BlockFlowPainter_h
+#define BlockFlowPainter_h
+
+namespace blink {
+
+class FloatingObject;
+class LayoutPoint;
+struct PaintInfo;
+class RenderBlockFlow;
+
+class BlockFlowPainter {
+public:
+    BlockFlowPainter(RenderBlockFlow& renderBlockFlow) : m_renderBlockFlow(renderBlockFlow) { }
+    void paintFloats(PaintInfo&, const LayoutPoint&, bool preservePhase);
+
+private:
+    RenderBlockFlow& m_renderBlockFlow;
+};
+
+} // namespace blink
+
+#endif // BlockFlowPainter_h