Move painting code from RenderView to ViewPainter.

Source/core/paint/ViewPainter.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 ViewPainter_h
+#define ViewPainter_h
+
+namespace blink {
+
+class LayoutPoint;
+struct PaintInfo;
+class RenderBox;
+class RenderView;
+
+class ViewPainter {
+public:
+    ViewPainter(RenderView& renderView) : m_renderView(renderView) { }
+
+    void paint(PaintInfo&, const LayoutPoint& paintOffset);
+    void paintBoxDecorationBackground(PaintInfo&);
+
+private:
+    bool rootFillsViewportBackground(RenderBox* rootBox) const;
+
+    RenderView& m_renderView;
+};
+
+} // namespace blink
+
+#endif // ViewPainter_h