Shadow: include shadow trees when adopting

Fixes WICG/webcomponents#182.

dom.bs

@@ -4583,13 +4583,14 @@ a <var>document</var>, run these steps:
   <p>If <var>document</var> is not the same as <var>oldDocument</var>, run these substeps:
 
   <ol>
-   <li><p>For each <var>descendant</var> in <var>node</var>'s <a>inclusive descendants</a>, in
-   <a>tree order</a>, set <var>descendant</var>'s <a>node document</a> to <var>document</var>.
+   <li><p>For each <var>inclusiveDescendant</var> in <var>node</var>'s
+   <a>shadow-including inclusive descendants</a>, in <a>shadow-including tree order</a>, set
+   <var>inclusiveDescendant</var>'s <a>node document</a> to <var>document</var>.
    <!--AttrExodus as well as any associated {{Attr}} nodes-->
 
-   <li><p>For each <var>descendant</var> in <var>node</var>'s <a>inclusive descendants</a>, in
-   <a>tree order</a>, run the <a>adopting steps</a> with <var>descendant</var> and
-   <var>oldDocument</var>.
+   <li><p>For each <var>inclusiveDescendant</var> in <var>node</var>'s
+   <a>shadow-including inclusive descendants</a>, in <a>shadow-including tree order</a>, run the
+   <a>adopting steps</a> with <var>inclusiveDescendant</var> and <var>oldDocument</var>.
   </ol>
 </ol>
 

dom.html

@@ -2546,9 +2546,9 @@ <h3 class="heading settled" data-level="4.5" id="interface-document"><span class
      <p>If <var>document</var> is not the same as <var>oldDocument</var>, run these substeps: </p>
      <ol>
       <li>
-       <p>For each <var>descendant</var> in <var>node</var>’s <a data-link-type="dfn" href="#concept-tree-inclusive-descendant">inclusive descendants</a>, in <a data-link-type="dfn" href="#concept-tree-order">tree order</a>, set <var>descendant</var>’s <a data-link-type="dfn" href="#concept-node-document">node document</a> to <var>document</var>. </p>
+       <p>For each <var>inclusiveDescendant</var> in <var>node</var>’s <a data-link-type="dfn" href="#concept-shadow-including-inclusive-descendant">shadow-including inclusive descendants</a>, in <a data-link-type="dfn" href="#concept-shadow-including-tree-order">shadow-including tree order</a>, set <var>inclusiveDescendant</var>’s <a data-link-type="dfn" href="#concept-node-document">node document</a> to <var>document</var>. </p>
       <li>
-       <p>For each <var>descendant</var> in <var>node</var>’s <a data-link-type="dfn" href="#concept-tree-inclusive-descendant">inclusive descendants</a>, in <a data-link-type="dfn" href="#concept-tree-order">tree order</a>, run the <a data-link-type="dfn" href="#concept-node-adopt-ext">adopting steps</a> with <var>descendant</var> and <var>oldDocument</var>. </p>
+       <p>For each <var>inclusiveDescendant</var> in <var>node</var>’s <a data-link-type="dfn" href="#concept-shadow-including-inclusive-descendant">shadow-including inclusive descendants</a>, in <a data-link-type="dfn" href="#concept-shadow-including-tree-order">shadow-including tree order</a>, run the <a data-link-type="dfn" href="#concept-node-adopt-ext">adopting steps</a> with <var>inclusiveDescendant</var> and <var>oldDocument</var>. </p>
      </ol>
    </ol>
    <p>The <dfn class="idl-code" data-dfn-for="Document" data-dfn-type="method" data-export="" id="dom-document-adoptnode"><code>adoptNode(<var>node</var>)</code><a class="self-link" href="#dom-document-adoptnode"></a></dfn> method, when invoked,