[CSSRegions]Change display values that allow regions

[CSSRegions]Change display values that allow regions
https://bugs.webkit.org/show_bug.cgi?id=89759

Patch by Andrei Onea <onea@adobe.com> on 2012-06-27
Reviewed by Tony Chang.

Source/WebCore:

Allow only elements with display values of block, inline-block,
table-cell, table-caption and list-item to become regions, as per
CSSRegions spec: http://dev.w3.org/csswg/css3-regions .
Also added test for checking whether regions are destroyed and/or created
when changing display value.

Test: fast/regions/region-element-display-change.html

* rendering/RenderObject.cpp:
(WebCore::RenderObject::createObject):
* rendering/style/RenderStyle.h:

LayoutTests:

Added checks for more display values, and modified results to reflect proper values that can become
regions. Also created new test for dynamically changing display values, making sure regions are
created or destroyed correctly.
* fast/regions/region-element-display-change-expected.txt: Added.
* fast/regions/region-element-display-change.html: Added.
* fast/regions/region-element-display-restriction-expected.txt:
* fast/regions/script-tests/region-element-display-change.js: Added.
(testElement):
* fast/regions/script-tests/region-element-display-restriction.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121352 268f45cc-cd09-0410-ab3c-d52691b4dbfc