New paint invalidation using paint property tree walk

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h

-// Copyright 2015 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 PaintPropertyTreeBuilder_h
-#define PaintPropertyTreeBuilder_h
-
-namespace blink {
-
-class FrameView;
-class LayoutObject;
-struct PaintPropertyTreeBuilderContext;
-
-// This class walks the whole layout tree, beginning from the root FrameView, across
-// frame boundaries. The walk will collect special things in the layout tree and create
-// paint property nodes for them. Special things include but not limit to: overflow clip,
-// transform, fixed-pos, animation, mask, filter, ... etc.
-// It expects to be invoked after layout clean, i.e. during InPaintPropertyUpdate phase.
-class PaintPropertyTreeBuilder {
-public:
-    void buildPropertyTrees(FrameView& rootFrame);
-
-private:
-    void walk(FrameView&, const PaintPropertyTreeBuilderContext&);
-    void walk(LayoutObject&, const PaintPropertyTreeBuilderContext&);
-};
-
-} // namespace blink
-
-#endif // PaintPropertyTreeBuilder_h