Merge pull request #3652 from AnalyticalGraphicsInc/fullscreen-fix

Fix fullscreen in firefox

Author: mramato

Source/Core/Fullscreen.js

@@ -173,11 +173,11 @@ define([
 
             // casing of Fullscreen differs across browsers
             name = prefix + 'FullscreenEnabled';
-            if (defined(document[name])) {
+            if (document[name] !== undefined) {
                 _names.fullscreenEnabled = name;
             } else {
                 name = prefix + 'FullScreenEnabled';
-                if (defined(document[name])) {
+                if (document[name] !== undefined) {
                     _names.fullscreenEnabled = name;
                 }
             }
@@ -188,7 +188,7 @@ define([
                 _names.fullscreenElement = name;
             } else {
                 name = prefix + 'FullScreenElement';
-                if (defined(document[name])) {
+                if (document[name] !== undefined) {
                     _names.fullscreenElement = name;
                 }
             }

Source/Scene/FrameRateMonitor.js

@@ -103,15 +103,15 @@ define([
             update(that, time);
         });
 
-        this._hiddenPropertyName = defined(document.hidden) ? 'hidden' :
-                                   defined(document.mozHidden) ? 'mozHidden' :
-                                   defined(document.msHidden) ? 'msHidden' :
-                                   defined(document.webkitHidden) ? 'webkitHidden' : undefined;
-
-        var visibilityChangeEventName = defined(document.hidden) ? 'visibilitychange' :
-            defined(document.mozHidden) ? 'mozvisibilitychange' :
-            defined(document.msHidden) ? 'msvisibilitychange' :
-            defined(document.webkitHidden) ? 'webkitvisibilitychange' : undefined;
+        this._hiddenPropertyName = (document.hidden !== undefined) ? 'hidden' :
+                                   (document.mozHidden !== undefined) ? 'mozHidden' :
+                                   (document.msHidden !== undefined) ? 'msHidden' :
+                                   (document.webkitHidden !== undefined) ? 'webkitHidden' : undefined;
+
+        var visibilityChangeEventName = (document.hidden !== undefined) ? 'visibilitychange' :
+            (document.mozHidden !== undefined) ? 'mozvisibilitychange' :
+            (document.msHidden !== undefined) ? 'msvisibilitychange' :
+            (document.webkitHidden !== undefined) ? 'webkitvisibilitychange' : undefined;
 
         function visibilityChangeListener() {
             visibilityChanged(that);