[SPV2] Implement the blink-side scroll property tree

third_party/WebKit/Source/platform/testing/PaintPrinters.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 PaintPrinters_h
 #define PaintPrinters_h
 
 #include <iosfwd>
 
 namespace blink {
 
 struct PaintChunk;
 struct PaintProperties;
 class ClipPaintPropertyNode;
 class TransformPaintPropertyNode;
 class EffectPaintPropertyNode;
+class ScrollPaintPropertyNode;
 
 // GTest print support for platform paint classes.
 //
 // To avoid ODR violations, these should also be declared in the respective
 // headers defining these types. This is required because otherwise a template
 // instantiation may be instantiated differently, depending on whether this
 // declaration is found.
 //
 // As a result, it is not necessary to include this file in tests in order to
 // use these printers. If, however, you get a link error about these symbols,
 // you need to make sure the blink_platform_test_support target is linked in
 // your unit test binary.
 void PrintTo(const ClipPaintPropertyNode&, std::ostream*);
 void PrintTo(const PaintChunk&, std::ostream*);
 void PrintTo(const PaintProperties&, std::ostream*);
 void PrintTo(const TransformPaintPropertyNode&, std::ostream*);
 void PrintTo(const EffectPaintPropertyNode&, std::ostream*);
+void PrintTo(const ScrollPaintPropertyNode&, std::ostream*);
 
 } // namespace blink
 
 #endif // PaintPrinters_h