Add support for HTMLIframeElement.allowFullscreen attribute
https://bugs.webkit.org/show_bug.cgi?id=161757

Reviewed by Sam Weinig.

LayoutTests/imported/w3c:

Rebaseline W3C test now that more checks are passing.

* web-platform-tests/html/dom/reflection-embedded-expected.txt:

Source/WebCore:

Add support for HTMLIframeElement.allowFullscreen attribute:
- https://html.spec.whatwg.org/#dom-iframe-allowfullscreen

Firefox and Chrome already support it, unprefixed.

Note that the HTMLIframeElement.allowFullscreen attribute reflects the
allowfullscreen content attribute which we already support.

Test: fullscreen/full-screen-iframe-allowFullscreen.html

* html/HTMLIFrameElement.idl:

LayoutTests:

Add layout test coverage.

* fullscreen/full-screen-iframe-allowFullscreen-expected.txt: Added.
* fullscreen/full-screen-iframe-allowFullscreen.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@205686 268f45cc-cd09-0410-ab3c-d52691b4dbfc
8 files changed