Fix an issue that subtitle is not shown for native fullscreen video that is inside an iframe

LayoutTests/fullscreen/full-screen-test.js

 var console = null;
 var printFullTestDetails = true; // This is optionaly switched of by test whose tested values can differ. (see disableFullTestDetailsPrinting())
 
 logConsole();
 
 if (window.testRunner) {
-    testRunner.dumpAsText();
+    if (window.runPixelTests)
+        testRunner.dumpAsTextWithPixelResults();
+    else
+        testRunner.dumpAsText();
     testRunner.waitUntilDone();
 }
 
 function runWithKeyDown(fn) 
 {
     // FIXME: WKTR does not yet support the keyDown() message.  Do a mouseDown here
     // instead until keyDown support is added.
     var eventName = !window.testRunner || eventSender.keyDown ? 'keypress' : 'mousedown'
 
     function thunk() {
@@ skipping 137 matching lines @@
     else
         consoleWrite(text + " <span style='color:red'>FAIL</span>");
 }
 
 function consoleWrite(text)
 {
     if (testEnded)
         return;
     logConsole().innerHTML += text + "<br>";
 }