Add the HTMLIFrameElement.allowFullscreen reflected attribute

http://whatwg.org/html#dom-iframe-allowfullscreen

BUG=383813

Review URL: https://codereview.chromium.org/398843002

git-svn-id: svn://svn.chromium.org/blink/trunk@178555 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/fast/dom/boolean-attribute-reflection-expected.txt

@@ -27,6 +27,10 @@ PASS e = make('hr'); e.removeAttribute('noshade'); e.noShade is false
 PASS e = make('hr'); e.setAttribute('noshade', ''); e.noShade is true
 PASS e = make('hr'); e.setAttribute('noshade', 'x'); e.noShade = false; e.getAttribute('noshade') is null
 PASS e = make('hr'); e.setAttribute('noshade', 'x'); e.noShade = true; e.getAttribute('noshade') is ''
+PASS e = make('iframe'); e.removeAttribute('allowfullscreen'); e.allowFullscreen is false
+PASS e = make('iframe'); e.setAttribute('allowfullscreen', ''); e.allowFullscreen is true
+PASS e = make('iframe'); e.setAttribute('allowfullscreen', 'x'); e.allowFullscreen = false; e.getAttribute('allowfullscreen') is null
+PASS e = make('iframe'); e.setAttribute('allowfullscreen', 'x'); e.allowFullscreen = true; e.getAttribute('allowfullscreen') is ''
 PASS e = make('img'); e.removeAttribute('ismap'); e.isMap is false
 PASS e = make('img'); e.setAttribute('ismap', ''); e.isMap is true
 PASS e = make('img'); e.setAttribute('ismap', 'x'); e.isMap = false; e.getAttribute('ismap') is null

third_party/WebKit/LayoutTests/fast/dom/script-tests/boolean-attribute-reflection.js

@@ -7,6 +7,7 @@ var attributes = [
     [ "form", "noValidate" ],
     [ "frame", "noResize" ],
     [ "hr", "noShade" ],
+    [ "iframe", "allowFullscreen" ],
     [ "img", "isMap" ],
     [ "input", "autofocus" ],
     [ "input", "defaultChecked", "checked" ],

third_party/WebKit/Source/core/html/HTMLIFrameElement.idl

@@ -20,6 +20,7 @@
 
 interface HTMLIFrameElement : HTMLElement {
     [Reflect] attribute DOMString align;
+    [Reflect] attribute boolean allowFullscreen;
     [Reflect] attribute DOMString frameBorder;
     [Reflect] attribute DOMString height;
     [Reflect, URL] attribute DOMString longDesc;