Disable insertion points in v1 shadow trees.

third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp

Index: third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp
diff --git a/third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp b/third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp
index ccf05a80afca47ba0092611129ff765fe93df283..024e3647d811dc7f998bf3f6d685313811209c35 100644
--- a/third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp
+++ b/third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp
@@ -276,6 +276,14 @@ const DestinationInsertionPoints* ElementShadow::destinationInsertionPointsFor(c
 
 void ElementShadow::distribute()
 {
+    if (isV1())
+        distributeV1();
+    else
+        distributeV0();
+}
+
+void ElementShadow::distributeV0()
+{
     host()->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::Shadow));
     WillBeHeapVector<RawPtrWillBeMember<HTMLShadowElement>, 32> shadowInsertionPoints;
     DistributionPool pool(*host());
@@ -318,6 +326,11 @@ void ElementShadow::distribute()
     InspectorInstrumentation::didPerformElementShadowDistribution(host());
 }
 
+void ElementShadow::distributeV1()
+{
+    // TODO(hayato): Implement this
+}
+
 void ElementShadow::didDistributeNode(const Node* node, InsertionPoint* insertionPoint)
 {
 #if ENABLE(OILPAN)