https://bugs.webkit.org/show_bug.cgi?id=81843

Reviewed by Ojan Vafai.

Replace WrapReverseContext with a vector of LineContexts that contain
the same information, plus values needed for flex-align.

alignChildren has been moved to after all the lines have been
positioned. We want to align children after flex-line-pack has changed
the size of each line to avoid unnecessary layouts.

No new tests, just refactoring.

* rendering/RenderFlexibleBox.cpp:
(WebCore::RenderFlexibleBox::LineContext::LineContext): New struct,
holds information needed for wrap-reverse and aligning children.
(RenderFlexibleBox::LineContext):
(WebCore::RenderFlexibleBox::layoutFlexItems): alignChildren after layout out all the lines rather than after each line.
(WebCore::RenderFlexibleBox::layoutAndPlaceChildren): don't alignChildren
(WebCore::RenderFlexibleBox::alignChildren): align all flex items, not just a line at a time.
(WebCore::RenderFlexibleBox::flipForWrapReverse): Update to use LineContext
* rendering/RenderFlexibleBox.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@111635 268f45cc-cd09-0410-ab3c-d52691b4dbfc