Optimize scroll adjustment for paint invalidation

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h

Index: third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h
index e082adae86f850d29ba4a320bb99ce0157582dd7..fa8be89b3c710c0b4072a20e7e2e566110cb0598 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h
@@ -529,6 +529,11 @@ class CORE_EXPORT LayoutBoxModelObject : public LayoutObject {
                               LayoutObject* beforeChild,
                               bool fullRemoveInsert = false);
 
+  // Non-composited scrolling should be included in the bounds of scrolled
+  // items. Since mapToVisualRectInAncestorSpace does not include scrolling of
+  // the ancestor, we need to add it back in after.
+  IntSize scrollAdjustmentForPaintInvalidation() const;
+
  private:
   void createLayer();