Revert changes is the use of CompositingReasonOutOfFlowClipping

third_party/WebKit/Source/core/layout/compositing/CompositingRequirementsUpdater.cpp

Index: third_party/WebKit/Source/core/layout/compositing/CompositingRequirementsUpdater.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositingRequirementsUpdater.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositingRequirementsUpdater.cpp
index b804e40dc567615791b155f1cad48df5b55a07f8..0adc936a55d43c145a1dd8d69af4dd2fe61cb6a8 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositingRequirementsUpdater.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositingRequirementsUpdater.cpp
@@ -288,7 +288,7 @@ void CompositingRequirementsUpdater::updateRecursive(
       unclippedDescendants.remove(unclippedDescendantsToRemove.at(
           unclippedDescendantsToRemove.size() - i - 1));
 
-    if (layer->clipParent()) {
+    if (reasonsToComposite & CompositingReasonOutOfFlowClipping) {
       // TODO(schenney): We only need to promote when the clipParent is not a descendant of the ancestor scroller,
       // which we do not check for here. Hence we might be promoting needlessly.
       unclippedDescendants.append(layer);