Port remaining Sky tests to the new world

sky/tests/dom/ownerScope.sky

-<sky>
-<script>
-import "../resources/third_party/unittest/unittest.dart";
-import "../resources/unit.dart";
-
-import "dart:sky";
-
-void main() {
-  initUnit();
-
-  test("should return null for elements not a child of a scope", () {
-    var doc = new Document();
-    var element = doc.createElement("div");
-    expect(element.owner, isNull);
-  });
-  test("should return the document for elements in the document scope", () {
-    var doc = new Document();
-    var element = doc.createElement("div");
-    doc.appendChild(element);
-    expect(element.owner, equals(doc));
-  });
-  test("should return the shadow root for elements in the shadow root scope", () {
-    var doc = new Document();
-    var host = doc.createElement("div");
-    var child = doc.createElement("div");
-    var shadowRoot = host.ensureShadowRoot();
-    shadowRoot.appendChild(child);
-    expect(child.owner, equals(shadowRoot));
-  });
-  test("should return self for a shadow root or document", () {
-    var doc = new Document();
-    var host = doc.createElement("div");
-    doc.appendChild(host);
-    var shadowRoot = host.ensureShadowRoot();
-    expect(shadowRoot.owner, equals(shadowRoot));
-    expect(doc.owner, equals(doc));
-  });
-  test("should dynamically update", () {
-    var doc = new Document();
-    var host = doc.createElement("div");
-    var child = doc.createElement("div");
-    var shadowRoot = host.ensureShadowRoot();
-    expect(child.owner, isNull);
-    shadowRoot.appendChild(child);
-    expect(child.owner, equals(shadowRoot));
-    child.remove();
-    expect(child.owner, isNull);
-  });
-}
-</script>
-</sky>