Convert position:sticky to position:static upon copy and paste

Convert position:sticky to position:static upon copy and paste
https://bugs.webkit.org/show_bug.cgi?id=128982

Reviewed by NOBODY (OOPS!).

Source/WebCore:

This patch has two parts:

1. Make sure that position:absolute elements trigger the position:relative wrapping (as
well as position:fixed)
2. Now that we copy position:sticky, convert that to position:fixed

Tests: editing/pasteboard/copy-paste-converts-fixed.html
       editing/pasteboard/copy-paste-converts-sticky.html
       editing/pasteboard/copy-paste-wraps-position-absolute.html

* editing/EditingStyle.cpp:
(WebCore::EditingStyle::convertFixedAndStickyPosition):

LayoutTests:

* editing/pasteboard/copy-paste-converts-fixed-expected.txt: Copied from LayoutTests/editing/pasteboard/copy-paste-converts-sticky-and-fixed-expected.txt.
* editing/pasteboard/copy-paste-converts-fixed.html: Copied from LayoutTests/editing/pasteboard/copy-paste-converts-sticky-and-fixed.html.
* editing/pasteboard/copy-paste-converts-sticky-expected.txt: Copied from LayoutTests/editing/pasteboard/copy-paste-converts-sticky-and-fixed-expected.txt.
* editing/pasteboard/copy-paste-converts-sticky.html: Copied from LayoutTests/editing/pasteboard/copy-paste-converts-sticky-and-fixed.html.
* editing/pasteboard/copy-paste-wraps-position-absolute-expected.txt: Renamed from LayoutTests/editing/pasteboard/copy-paste-converts-sticky-and-fixed-expected.txt.
* editing/pasteboard/copy-paste-wraps-position-absolute.html: Renamed from LayoutTests/editing/pasteboard/copy-paste-converts-sticky-and-fixed.html.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@164299 268f45cc-cd09-0410-ab3c-d52691b4dbfc