Fix invalidation during painting of scrollbars

Source/core/layout/LayoutBox.cpp

Index: Source/core/layout/LayoutBox.cpp
diff --git a/Source/core/layout/LayoutBox.cpp b/Source/core/layout/LayoutBox.cpp
index 6c96e11737005747c74fae729231500dbf8e7f9b..557df15b0fdb5c4ab1172ef3068c57b7a1085342 100644
--- a/Source/core/layout/LayoutBox.cpp
+++ b/Source/core/layout/LayoutBox.cpp
@@ -600,6 +600,19 @@ LayoutUnit LayoutBox::constrainContentBoxLogicalHeightByMinMax(LayoutUnit logica
     return std::max(logicalHeight, computeContentLogicalHeight(styleToUse.logicalMinHeight(), intrinsicContentHeight));
 }
 
+void LayoutBox::setLocationAndUpdateOverflowControlsIfNeeded(const LayoutPoint& location)
+{
+    if (LayerScrollableArea* scrollableArea = this->scrollableArea()) {
+        IntSize oldPixelSnappedBorderRectSize = pixelSnappedBorderBoxRect().size();
+        setLocation(location);
+        if (pixelSnappedBorderBoxRect().size() != oldPixelSnappedBorderRectSize)
+            scrollableArea->updateAfterLayout();
+        return;
+    }
+
+    setLocation(location);
+}
+
 IntRect LayoutBox::absoluteContentBox() const
 {
     // This is wrong with transforms and flipped writing modes.
@@ -1719,7 +1732,7 @@ void LayoutBox::positionLineBox(InlineBox* box)
     } else if (isReplaced()) {
         // FIXME: the call to roundedLayoutPoint() below is temporary and should be removed once
         // the transition to LayoutUnit-based types is complete (crbug.com/321237)
-        setLocation(box->topLeft().roundedLayoutPoint());
+        setLocationAndUpdateOverflowControlsIfNeeded(box->topLeft().roundedLayoutPoint());
         setInlineBoxWrapper(box);
     }
 }