Include control clip in list of clip-related properties.

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

Index: third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
index ae0dcc65cc9ceae71c10d3c3b75440b14e1082e9..e6470a223eafabe2c7fe675ddf73dcd155a6be19 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
@@ -48,10 +48,12 @@ static const PaintLayer* findParentLayerOnClippingContainerChain(
     if (current->hasLayer())
       return static_cast<const LayoutBoxModelObject*>(current)->layer();
     // Having clip or overflow clip forces the LayoutObject to become a layer,
-    // except for contains: paint, which may apply to SVG.
+    // except for contains: paint, which may apply to SVG, and
+    // control clip, which may apply to LayoutBox subtypes.
     // SVG (other than LayoutSVGRoot) cannot have PaintLayers.
     DCHECK(!current->hasClipRelatedProperty() ||
-           current->styleRef().containsPaint());
+           current->styleRef().containsPaint() ||
+           (current->isBox() && toLayoutBox(current)->hasControlClip()));
   }
   ASSERT_NOT_REACHED();
   return nullptr;