Fix LayoutTests that assume canplay, playing, and canplaythrough will only fire once.

LayoutTests/media/video-test.js

 
 var video = null;
 var mediaElement = document; // If not set, an event from any element will trigger a waitForEvent() callback.
 var console = null;
 var printFullTestDetails = true; // This is optionaly switched of by test whose tested values can differ. (see disableFullTestDetailsPrinting())
 var Failed = false;
 
 var track = null; // Current TextTrack being tested.
 var cues = null; // Current TextTrackCueList being tested.
 var numberOfTrackTests = 0;
@@ skipping 130 matching lines @@
 function run(testFuncString)
 {
     consoleWrite("RUN(" + testFuncString + ")");
     try {
         eval(testFuncString);
     } catch (ex) {
         consoleWrite(ex);
     }
 }
 
-function waitForEventOnce(eventName, func, endit)
+function waitForEventOnce(eventName, func, endit, doNotLog)
 {
-    waitForEvent(eventName, func, endit, true)
+    waitForEvent(eventName, func, endit, true, null, doNotLog)
 }
 
 function waitForEventAndEnd(eventName, funcString)
 {
-    waitForEvent(eventName, funcString, true)
+    waitForEvent(eventName, funcString, true, false, null, false)
 }
 
-function waitForEvent(eventName, func, endit, oneTimeOnly, element)
+function waitForEvent(eventName, func, endit, oneTimeOnly, element, doNotLog)
 {
     if (!element)
         element = mediaElement;
 
     function _eventCallback(event)
     {
         if (oneTimeOnly)
             element.removeEventListener(eventName, _eventCallback, true);
 
-        consoleWrite("EVENT(" + eventName + ")");
+        if (!doNotLog)
+          consoleWrite("EVENT(" + eventName + ")");
 
         if (func)
             func(event);
 
         if (endit)
             endTest();
     }
 
     element.addEventListener(eventName, _eventCallback, true);
 }
@@ skipping 169 matching lines @@
 
         func();
     }
 
     requiredEvents = [];
     for (var i = 0; i < eventList.length; i++) {
         requiredEvents[i] = eventList[i][1];
         eventList[i][0].addEventListener(requiredEvents[i], _eventCallback, true);
     }
 }