Crash from line break iterators in counter content

Crash from line break iterators in counter content
https://bugs.webkit.org/show_bug.cgi?id=72977

Patch by Ken Buchanan <kenrb@chromium.org> on 2012-02-14
Reviewed by David Hyatt.

Source/WebCore:

Calculating the width of counter text can sometimes cause the
underlying text buffer to change. This patch causes the iterator
to reset appropriately when this happens.

* rendering/RenderBlockLineLayout.cpp:
(WebCore::RenderBlock::LineBreaker::nextLineBreak):

LayoutTests:

Test that causes asterisk counters to change during layout
and potentially confuse iterators.

* fast/css/counters/asterisk-counter-update-after-layout-crash-expected.txt: Added
* fast/css/counters/asterisk-counter-update-after-layout-crash.html: Added

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@107733 268f45cc-cd09-0410-ab3c-d52691b4dbfc