Add shadow root support. (tests broken)

src/lib/template/dom-if.html

@@ -73,7 +73,10 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     },
 
     detached: function() {
-      if (!this.parentNode || this.parentNode.nodeType == Node.DOCUMENT_FRAGMENT_NODE) {
+      if (!this.parentNode ||
+          (this.parentNode.nodeType == Node.DOCUMENT_FRAGMENT_NODE &&
+           (!Polymer.Settings.hasShadow ||
+            !(this.parentNode instanceof ShadowRoot)))) {
         this._teardownInstance();
       }
     },

test/unit/dom-if.html

@@ -657,14 +657,40 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
       test('move into doc fragment', function(done) {
         var el = shouldBeRemoved;
+        assert.equal(el.parentNode, removalContainer);
         var frag = document.createDocumentFragment();
         Polymer.dom(frag).appendChild(toBeRemoved);
         setTimeout(function() {
           assert.equal(el.parentNode, null);
-          done();
+          Polymer.dom(removalContainer).appendChild(frag);
+          setTimeout(function() {
+            assert.equal(shouldBeRemoved.parentNode, removalContainer);
+            done();
+          });
         });
       });
 
+      test('move into shadow root', function(done) {
+        if (Polymer.Settings.hasShadow) {
+          var el = shouldBeRemoved;
+          assert.equal(el.parentNode, removalContainer);
+          var div = document.createElement('div');
+          document.body.appendChild(div);
+          var frag = div.createShadowRoot();
+          Polymer.dom(frag).appendChild(toBeRemoved);
+          setTimeout(function() {
+            assert.equal(el.parentNode, null);
+            Polymer.dom(removalContainer).appendChild(frag);
+            setTimeout(function() {
+              assert.equal(shouldBeRemoved.parentNode, removalContainer);
+              done();
+            });
+          });
+        } else {
+          done();
+        }
+      });
+
     });