https://bugs.webkit.org/show_bug.cgi?id=120535

Reviewed by Darin Adler.

Source/WebCore:

Test: fast/repaint/overflow-scroll-touch-repaint.html

We want to require a layout when the value of -webkit-overflow-scrolling changes
since -webkit-overflow-scrolling creates a stacking context.

* rendering/style/RenderStyle.cpp:
(WebCore::RenderStyle::changeRequiresLayout):

LayoutTests:

Add a test to ensure we perform a layout and repaint when the
value of -webkit-overflow-scrolling changes on an element.

At the time of writing, the iOS port enables ACCELERATED_OVERFLOW_SCROLLING.

* fast/repaint/overflow-scroll-touch-repaint-expected.txt: Added.
* fast/repaint/overflow-scroll-touch-repaint.html: Added.
* platform/efl/TestExpectations: Skip test fast/repaint/overflow-scroll-touch-repaint.html
since this platform doesn't enable ACCELERATED_OVERFLOW_SCROLLING.
* platform/gtk/TestExpectations: Ditto.
* platform/mac/TestExpectations: Ditto.
* platform/qt/TestExpectations: Ditto.
* platform/win/TestExpectations: Ditto.
* platform/wincairo/TestExpectations: Ditto.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154993 268f45cc-cd09-0410-ab3c-d52691b4dbfc