[CSS3 Regions] Make sure overflow:visible lets content spill out of regions.
        
Add support for reverse iteration to ListHashSet to support being able to walk them
backwards easily.

Reviewed by Anders Carlsson.

* wtf/ListHashSet.h:
(WTF::ListHashSetReverseIterator::ListHashSetReverseIterator):
(WTF::ListHashSetReverseIterator::get):
(WTF::ListHashSetReverseIterator::operator*):
(WTF::ListHashSetReverseIterator::operator->):
(WTF::ListHashSetReverseIterator::operator++):
(WTF::ListHashSetReverseIterator::operator--):
(WTF::ListHashSetReverseIterator::operator==):
(WTF::ListHashSetReverseIterator::operator!=):
(WTF::ListHashSetReverseIterator::operator const_reverse_iterator):
(WTF::ListHashSetReverseIterator::node):
(WTF::ListHashSetConstReverseIterator::ListHashSetConstReverseIterator):
(WTF::ListHashSetConstReverseIterator::get):
(WTF::ListHashSetConstReverseIterator::operator*):
(WTF::ListHashSetConstReverseIterator::operator->):
(WTF::ListHashSetConstReverseIterator::operator++):
(WTF::ListHashSetConstReverseIterator::operator--):
(WTF::ListHashSetConstReverseIterator::operator==):
(WTF::ListHashSetConstReverseIterator::operator!=):
(WTF::ListHashSetConstReverseIterator::node):
(WTF::::rbegin):
(WTF::::rend):
(WTF::::makeReverseIterator):
(WTF::::makeConstReverseIterator):
(WTF::::makeConstIterator):

Source/WebCore: https://bugs.webkit.org/show_bug.cgi?id=69372
        
[CSS3 Regions] Make sure overflow:visible lets content spill out of regions.

Reviewed by Anders Carlsson.

No new tests, since plenty of results changed.

* rendering/RenderFlowThread.cpp:
(WebCore::RenderFlowThread::paintIntoRegion):
(WebCore::RenderFlowThread::hitTestRegion):
(WebCore::RenderFlowThread::repaintRectangleInRegions):
(WebCore::RenderFlowThread::firstRegion):
(WebCore::RenderFlowThread::lastRegion):
* rendering/RenderFlowThread.h:
* rendering/RenderRegion.cpp:
(WebCore::RenderRegion::regionOverflowRect):
(WebCore::RenderRegion::isFirstRegion):
(WebCore::RenderRegion::isLastRegion):
(WebCore::RenderRegion::layout):
* rendering/RenderRegion.h:
(WebCore::RenderRegion::setRegionRect):
(WebCore::RenderRegion::regionRect):

LayoutTests: https://bugs.webkit.org/show_bug.cgi?id=69372
        
[CSS3 Regions] Make sure overflow:visible lets content spill out of regions.

Reviewed by Anders Carlsson.

* platform/mac/fast/regions/content-flowed-into-regions-dynamically-removed-expected.png:
* platform/mac/fast/regions/percentage-margins-mixed-ltr-dominant-regions-expected.png:
* platform/mac/fast/regions/percentage-margins-mixed-rtl-dominant-regions-expected.png:
* platform/mac/fast/regions/percentage-margins-rtl-variable-width-regions-expected.png:
* platform/mac/fast/regions/percentage-margins-variable-width-regions-expected.png:
* platform/mac/fast/regions/webkit-flow-double-pagination-float-push-expected.png:
* platform/mac/fast/regions/webkit-flow-float-unable-to-push-expected.png:
* platform/mac/fast/regions/webkit-flow-floats-inside-regions-bounds-expected.png:
* platform/mac/fast/regions/webkit-flow-inlines-dynamic-expected.png:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96643 268f45cc-cd09-0410-ab3c-d52691b4dbfc