Adding supported checks for CssMatrix and Point.

samples/swarm/swarm_ui_lib/touch/FxUtil.dart

Index: samples/swarm/swarm_ui_lib/touch/FxUtil.dart
diff --git a/samples/swarm/swarm_ui_lib/touch/FxUtil.dart b/samples/swarm/swarm_ui_lib/touch/FxUtil.dart
index 858eb377427cb9558af44505fb2af49adfd15493..b3858628604eca39f3b6b48528b4428b6dcc648b 100644
--- a/samples/swarm/swarm_ui_lib/touch/FxUtil.dart
+++ b/samples/swarm/swarm_ui_lib/touch/FxUtil.dart
@@ -67,11 +67,11 @@ class FxUtil {
    * changed.
    */
   static Coordinate computeRelativePosition(Element element, Element target) {
-    final testPoint = new Point(0, 0);
+    final testPoint = new DomPoint(0, 0);
     final pagePoint =
-        window.webkitConvertPointFromNodeToPage(element, testPoint);
+        window.convertPointFromNodeToPage(element, testPoint);
     final pointRelativeToTarget =
-        window.webkitConvertPointFromPageToNode(target, pagePoint);
+        window.convertPointFromPageToNode(target, pagePoint);
     return new Coordinate(pointRelativeToTarget.x, pointRelativeToTarget.y);
   }