Bug 1031726 - Implement clip:rect() correctly when fragments are involved, for both box-decoration-break:slice/clone.  r=roc
Bug 1032450 - Flag the reflow state for a table frame as a "dummy" state if its parent state is.  r=roc

InitCBReflowState() copies the mCBReflowState from the parent
reflow state for table frames, which is null for "dummy" states,
so it would lead to a crash in InitConstraints() which assumes
non-dummy states has a non-null mCBReflowState.
Bug 723669 - Add reftest. r=mats