Roll 50: Updated for push to origin/master.

tools/dom/templates/html/impl/impl_TouchEvent.darttemplate

Index: tools/dom/templates/html/impl/impl_TouchEvent.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_TouchEvent.darttemplate b/tools/dom/templates/html/impl/impl_TouchEvent.darttemplate
index 3fa5e27465b41858d26269c7df9da164bcb81824..35640d5c35c3f65abf89a5d7df4b9b68866f7885 100644
--- a/tools/dom/templates/html/impl/impl_TouchEvent.darttemplate
+++ b/tools/dom/templates/html/impl/impl_TouchEvent.darttemplate
@@ -15,18 +15,25 @@ $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS
     if (view == null) {
       view = window;
     }
+$if DART2JS
     TouchEvent e = document._createEvent("TouchEvent");
+$else
+    TouchEvent e = _blink.BlinkTouchEvent.instance.constructorCallback_1_(type);
+$endif
     e._initTouchEvent(touches, targetTouches, changedTouches, type, view,
         screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey, metaKey);
     return e;
   }
 $!MEMBERS
-
   /**
    * Checks if touch events supported on the current platform.
    *
    * Note that touch events are only supported if the user is using a touch
    * device.
    */
+$if DART2JS
   static bool get supported => Device.isEventTypeSupported('TouchEvent');
+$else
+  static bool get supported => true;
+$endif
 }