Wrap Window in case it's a window from a different page / frame.

tests/html/inner_frame_test.dart

Index: tests/html/inner_frame_test.dart
diff --git a/tests/html/inner_frame_test.dart b/tests/html/inner_frame_test.dart
index 799cb63e833d522c259cda82db0351f00b68bba6..c14fa7956ba5ff19d2155e70fe7955f82d417add 100644
--- a/tests/html/inner_frame_test.dart
+++ b/tests/html/inner_frame_test.dart
@@ -10,30 +10,60 @@ main() {
     // The child's frame should not be able to access its parent's
     // document.
 
-    // Check window.frameElement.
-    try {
-      var parentDocument = window.frameElement.document;
-      var div = parentDocument.$dom_createElement("div");
-      div.id = "illegalFrameElement";
-      parentDocument.body.nodes.add(div);
-      Expect.fail('Should not reach here.');
-    } on NoSuchMethodError catch (e) {
-      // Expected.
-    }
-
-    // Check window.top.
-    try {
-      final top = window.top;
-      var parentDocument = top.document;
-      var div = parentDocument.$dom_createElement("div");
-      div.id = "illegalTop";
-      parentDocument.body.nodes.add(div);
-      Expect.fail('Should not reach here.');
-    } catch (e) {
-      // Expected.
-      // TODO(vsm): Enforce this is a NoSuchMethodError.
-    }
-    return;
+    window.on.message.add((Event e) {
+      switch (e.data) {
+      case 'frameElement': {
+        // Check window.frameElement.
+        try {
+          var parentDocument = window.frameElement.document;
+          var div = parentDocument.$dom_createElement("div");
+          div.id = "illegalFrameElement";
+          parentDocument.body.nodes.add(div);
+          Expect.fail('Should not reach here.');
+        } on NoSuchMethodError catch (e) {
+          // Expected.
+          window.top.postMessage('pass_frameElement', '*');
+        } catch (e) {
+          window.top.postMessage('fail_frameElement', '*');
+        }
+        return;
+      }
+      case 'top': {
+        // Check window.top.
+        try {
+          final top = window.top;
+          var parentDocument = top.document;
+          var div = parentDocument.$dom_createElement("div");
+          div.id = "illegalTop";
+          parentDocument.body.nodes.add(div);
+          Expect.fail('Should not reach here.');
+        } on NoSuchMethodError catch (e) {
+          // Expected.
+          window.top.postMessage('pass_top', '*');
+        } catch (e) {
+          window.top.postMessage('fail_top', '*');
+        }
+        return;
+      }
+      case 'parent': {
+        // Check window.parent.
+        try {
+          final parent = window.parent;
+          var parentDocument = parent.document;
+          var div = parentDocument.$dom_createElement("div");
+          div.id = "illegalParent";
+          parentDocument.body.nodes.add(div);
+          Expect.fail('Should not reach here.');
+        } on NoSuchMethodError catch (e) {
+          // Expected.
+          window.top.postMessage('pass_parent', '*');
+        } catch (e) {
+          window.top.postMessage('fail_parent', '*');
+        }
+        return;
+      }
+      }
+      });
   }
 
   // Parent / test frame
@@ -41,23 +71,50 @@ main() {
 
   final iframe = new Element.tag('iframe');
   iframe.src = window.location.href;
+  var child;
 
   test('prepare', () {
-      iframe.on.load.add(expectAsync1((e) {}));
+      iframe.on.load.add(expectAsync1((e) { child = iframe.contentWindow;}));
       document.body.nodes.add(iframe);
     });
 
+  final validate = (testName, verify) {
+    final expectedVerify = expectAsync0(verify);
+    window.on.message.add((e) {
+      guardAsync(() {
+          if (e.data == 'pass_$testName') {
+            expectedVerify();
+          }
+          expect(e.data != 'fail_$testName');
+        });
+      });
+    child.postMessage(testName, '*');
+  };
+
   test('frameElement', () {
-      var div = document.query('#illegalFrameElement');
+      validate('frameElement', () {
+        var div = document.query('#illegalFrameElement');
 
-      // Ensure that this parent frame was not modified by its child.
-      Expect.isNull(div);
+        // Ensure that this parent frame was not modified by its child.
+        expect(div, isNull);
+      });
     });
 
   test('top', () {
-      var div = document.query('#illegalTop');
+      validate('top', () {
+        var div = document.query('#illegalTop');
+
+        // Ensure that this parent frame was not modified by its child.
+        expect(div, isNull);
+      });
+    });
+
+  test('parent', () {
+      validate('parent', () {
+        var div = document.query('#illegalParent');
 
-      // Ensure that this parent frame was not modified by its child.
-      Expect.isNull(div);
+        // Ensure that this parent frame was not modified by its child.
+        expect(div, isNull);
+      });
     });
 }