Force full invalidation after layoutScope.setNeedsLayout() in PaintLayerScrollableArea::finalizeScr…

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

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index 282ec669367b4182c74c08c441d105b5eceb4465..29ab883ec348664c08b3a50d519bcd217cdea14f 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -676,6 +676,9 @@ void PaintLayerScrollableArea::finalizeScrollDimensions(const DoubleSize& origin
                 m_inOverflowRelayout = true;
                 SubtreeLayoutScope layoutScope(box());
                 layoutScope.setNeedsLayout(&box(), LayoutInvalidationReason::ScrollbarChanged);
+                // TODO(wangxianzhu): Remove the following statement when paint invalidation
+                // can detect client box changes. crbug.com/560418.
+                box().setShouldDoFullPaintInvalidation();
                 if (box().isLayoutBlock()) {
                     LayoutBlock& block = toLayoutBlock(box());
                     block.scrollbarsChanged(autoHorizontalScrollBarChanged, autoVerticalScrollBarChanged);