Force compositing inputs to be clean for getBoundingClientRect

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 07efaa1659d7b483f2b6c5208239cee1cc15cc2e..2c6b496494c0296a9d1397462a61c25874254622 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -826,6 +826,10 @@ void PaintLayerScrollableArea::updateAfterLayout() {
 
   DisableCompositingQueryAsserts disabler;
   positionOverflowControls();
+
+  // Layout of a scrollable area, or any of its descendants (sticky or
+  // otherwise), invalidates the cached sticky constraints.
+  invalidateAllStickyConstraints();
 }
 
 void PaintLayerScrollableArea::clampScrollOffsetAfterOverflowChange() {