https://bugs.webkit.org/show_bug.cgi?id=96332

Reviewed by James Robinson.

Source/WebCore:

Since fixed position elements can now sometimes become stacking
contexts, explicitly set position: static on full-screen ancestors so
that there are no stacking context ancestors that could cause the full
screen element to become incorrectly sorted.

Test: fullscreen/full-screen-fixed-pos-parent.html

* css/fullscreen.css:
(:-webkit-full-screen-ancestor:not(iframe)):

LayoutTests:

This test has an all red image that (without this patch) incorrectly
sorts on top of the full screen element. With this patch, the all
green full screen element appears on top.

* fullscreen/full-screen-fixed-pos-parent-expected.png: Added.
* fullscreen/full-screen-fixed-pos-parent-expected.txt: Added.
* fullscreen/full-screen-fixed-pos-parent.html: Added.
* fullscreen/resources/green.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@128514 268f45cc-cd09-0410-ab3c-d52691b4dbfc