Disable insertion points in v1 shadow trees.

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

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 63 matching lines @@
 private:
     ElementShadow();
 
 #if !ENABLE(OILPAN)
     void removeDetachedShadowRoots();
 #endif
 
     void distribute();
     void clearDistribution();
 
+    void distributeV0();
+    void distributeV1();

[kochi, 2015/10/21 03:13:51]

Do we use "V1" in the source code?
I guess V0 is okay, will deprecate eventually, but I'm not sure V1 is
a proper naming.

The same goes to isV1() below.

Eventually we are "V1 by default", which means we should not check if
this is V1 or not... then I would think that isV0() check is more
natural way for the time being to special-case old behavior.

e.g.

void distribute()
{
   if (isV0) {
       distributeV0();
       return;
    }

    //... do what is expected in V1
}

+
     void collectSelectFeatureSetFrom(ShadowRoot&);
     void distributeNodeChildrenTo(InsertionPoint*, ContainerNode*);
 
     bool needsSelectFeatureSet() const { return m_needsSelectFeatureSet; }
     void setNeedsSelectFeatureSet() { m_needsSelectFeatureSet = true; }
 
+    bool isV1() const { return youngestShadowRoot().type() == ShadowRootType::Open || youngestShadowRoot().type() == ShadowRootType::Closed; };
+
 #if ENABLE(OILPAN)
     // The cost of |new| in Oilpan is lower than non-Oilpan.  We should reduce
     // the size of HashMap entry.
     typedef HeapHashMap<Member<const Node>, Member<DestinationInsertionPoints>> NodeToDestinationInsertionPoints;
 #else
     typedef HashMap<const Node*, DestinationInsertionPoints> NodeToDestinationInsertionPoints;
 #endif
     NodeToDestinationInsertionPoints m_nodeToInsertionPoints;
 
     SelectRuleFeatureSet m_selectFeatures;
@@ skipping 33 matching lines @@
 inline void ElementShadow::distributeIfNeeded()
 {
     if (m_needsDistributionRecalc)
         distribute();
     m_needsDistributionRecalc = false;
 }
 
 } // namespace
 
 #endif