Make js-test-post a noop.

LayoutTests/fast/events/touch/gesture/resources/gesture-helpers.js

 function recordWheel(event)
 {
     debug('wheel event ' + wheelEventsOccurred + '+> ' + event.target);
     wheelEventsOccurred++;
 }
 
 function recordScroll(event)
 {
     debug('scroll event ' + scrollEventsOccurred + '+> ' + event.target);
     scrollEventsOccurred++;
 
     if (window.eventSender) {
         // Because scroll events arrive asynchronously, only one will arrive.
         if (gesturesOccurred == expectedGesturesTotal) {
             shouldBe('scrollEventsOccurred', expectedScrollEventsOccurred);
-            // If we've got here, we've passed.
-            successfullyParsed = true;
-            isSuccessfullyParsed();
-            if (window.testRunner)
-                testRunner.notifyDone();
+            if (window.jsTestIsAsync) {
+                finishJSTest();
+            } else {
+                // If we've got here, we've passed.
+                successfullyParsed = true;
+                isSuccessfullyParsed();
+                if (window.testRunner)
+                    testRunner.notifyDone();
+            }
         }
     }
 }
 
 function exitIfNecessary()
 {
     debug('gesture events not implemented on this platform or gesture event scrolling of a document is broken');
-    successfullyParsed = true;
-    isSuccessfullyParsed();
-    if (window.testRunner)
-        testRunner.notifyDone();
+    if (window.jsTestIsAsync) {
+        finishJSTest();
+    } else {
+        // If we've got here, we've passed.
+        successfullyParsed = true;
+        isSuccessfullyParsed();
+        if (window.testRunner)
+            testRunner.notifyDone();
+    }
 }
 
 function checkTestDependencies()
 {
     return eventSender.gestureScrollBegin && eventSender.gestureScrollUpdate && eventSender.gestureScrollEnd;
 }
 
 function checkScrollOffset()
 {
     if (window.eventSender) {
         shouldBe(scrolledElement + '.' + 'scrollTop', scrollAmountY[gesturesOccurred]);
         shouldBe(scrolledElement + '.' + 'scrollLeft', scrollAmountX[gesturesOccurred]);
         shouldBe('wheelEventsOccurred', expectedWheelEventsOccurred[gesturesOccurred]);
         gesturesOccurred++;
     }
     if (gesturesOccurred < expectedGesturesTotal) {
         wheelEventsOccurred = 0;
         secondGestureScroll();
     }
 }