Define contentsProperties on ObjectPaintProperties, for use in paint invalidation.

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

 // 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.
 
 #include "core/paint/PaintPropertyTreeBuilder.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutInline.h"
@@ skipping 468 matching lines @@
 
 void PaintPropertyTreeBuilder::buildTreeNodesForChildren(const LayoutObject& object, PaintPropertyTreeBuilderContext& context)
 {
     if (!object.isBoxModelObject() && !object.isSVG())
         return;
 
     updateOverflowClip(object, context);
     updatePerspective(object, context);
     updateSvgLocalToBorderBoxTransform(object, context);
     updateScrollTranslation(object, context);
+
+    if (object.objectPaintProperties()) {
+        std::unique_ptr<PropertyTreeState> contentsProperties =
+            wrapUnique(new PropertyTreeState(context.current.transform, context.current.clip, context.currentEffect));
+        object.getMutableForPainting().objectPaintProperties()->setContentsProperties(std::move(contentsProperties));
+    }
+
     updateOutOfFlowContext(object, context);
 }
 
 } // namespace blink