The testcase to be attached has a bad transition shorthand, and it crashes if accelerated transitions are enabled.
Created attachment 28912 [details] Testcase
Created attachment 29248 [details] Patch with test
Sending LayoutTests/ChangeLog Adding LayoutTests/transitions/bad-transition-shorthand-crash-expected.txt Adding LayoutTests/transitions/bad-transition-shorthand-crash.html Sending WebCore/ChangeLog Sending WebCore/page/animation/CompositeAnimation.cpp Sending WebCore/page/animation/ImplicitAnimation.cpp Transmitting file data ...... Committed revision 42222.