[Cocoa] Add SPI to get a WebArchive of the WKWebView
<rdar://problem/16748120>
https://bugs.webkit.org/show_bug.cgi?id=133439

Reviewed by Anders Carlsson.

* UIProcess/API/Cocoa/WKWebView.mm:
(-[WKWebView _getWebArchiveDataWithCompletionHandler:]):
* UIProcess/API/Cocoa/WKWebViewPrivate.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@169520 268f45cc-cd09-0410-ab3c-d52691b4dbfc
EFL gardening. Unskip some iframe tests which have passed since buildbot OS bump up.

* platform/efl-wk1/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@169521 268f45cc-cd09-0410-ab3c-d52691b4dbfc