Bug 690989 - Ensure we're focused before requesting fullscreen in rollback test. r=smaug a=test-only

content/html/content/test/file_fullscreen-rollback.html

@@ -54,6 +54,11 @@ function e(id) {
   return document.getElementById(id);
 }
 
+function requestFullscreen(element) {
+  element.focus();
+  element.mozRequestFullScreen();
+}
+
 function begin() {
   addListener("change", change1);
   e("fse").mozRequestFullScreen();
@@ -65,7 +70,7 @@ function change1() {
   is(document.mozFullScreenElement, e("fse"), "Body should be FSE");
   
   // Request full-screen from element not descendent from current FSE.
-  e("non-fse").mozRequestFullScreen();
+  requestFullscreen(e("non-fse"));
 }
 
 function error1() {
@@ -73,7 +78,7 @@ function error1() {
   addListener("change", change2);
   is(document.mozFullScreenElement, e("fse"), "FSE should not change");
   var iframe = e("subdoc");
-  iframe.contentDocument.body.mozRequestFullScreen();
+  requestFullscreen(iframe.contentDocument.body);
 }
 
 function change2() {
@@ -96,14 +101,14 @@ function change4() {
   removeListener("change", change4);
   is(document.mozFullScreenElement, null, "Should have left full-screen entirely");
   addListener("change", change5);
-  e("fse").mozRequestFullScreen();
+  requestFullscreen(e("fse"));
 }
 
 function change5() {
   removeListener("change", change5);
   addListener("change", change6);
   is(document.mozFullScreenElement, e("fse"), "FSE should be e('fse')");
-  e("fse-inner").mozRequestFullScreen();
+  requestFullscreen(e("fse-inner"));
 }
 
 function change6() {