Fixed tests for DOMPoint support for dart2js.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 09eac05683206cd72322c478fb7b2f3c7ba9d975..019cc214f387fc41c588908cd768aca1e1d73ceb 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -10150,6 +10150,9 @@ class DomPoint extends DomPointReadOnly {
     throw new ArgumentError("Incorrect number or type of arguments");
   }
 
+  /// Checks if this type is supported on the current platform.
+  static bool get supported => true;
+
   @DomName('DOMPoint.w')
   @DocsEditable()
   @Experimental() // untriaged
@@ -33107,7 +33110,7 @@ class Window extends EventTarget implements WindowEventHandlers, WindowBase, Glo
    * convertPointFromNodeToPage and convertPointFromPageToNode are removed.
    * see http://dev.w3.org/csswg/cssom-view/#geometry
    */
-  static bool get supportsPointConversions => true;
+  static bool get supportsPointConversions => DomPoint.supported;
   // To suppress missing implicit constructor warnings.
   factory Window._() { throw new UnsupportedError("Not supported"); }