Disable insertion points in v1 shadow trees.

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

Index: third_party/WebKit/Source/core/dom/shadow/ElementShadow.h
diff --git a/third_party/WebKit/Source/core/dom/shadow/ElementShadow.h b/third_party/WebKit/Source/core/dom/shadow/ElementShadow.h
index e55b0cbea158533e3b9706ff767058bb6f59ba39..7d48679c39804d0e821ffd413b4091ada1e9c713 100644
--- a/third_party/WebKit/Source/core/dom/shadow/ElementShadow.h
+++ b/third_party/WebKit/Source/core/dom/shadow/ElementShadow.h
@@ -81,12 +81,17 @@ private:
     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.