Preliminary paint property walk implementation for SPv2

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

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
new file mode 100644
index 0000000000000000000000000000000000000000..88c4367ea495c843005242acbddff5104fa8163f
--- /dev/null
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h
@@ -0,0 +1,28 @@
+// 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 LayoutBoxModelObject;
+class LayoutObject;
+struct PaintPropertyTreeNode;
+
+class PaintPropertyTreeBuilder {
+public:
+    void buildPropertyTrees(FrameView& rootFrame);
+
+private:
+    struct Context;
+
+    void walk(FrameView&, const Context&);
+    void walk(LayoutBoxModelObject&, const Context&);
+};
+
+} // namespace blink
+
+#endif // PaintPropertyTreeBuilder_h