Bug 1341009 - Add nsReflowStatus::IsEmpty() assertion to nsAbsoluteContainingBlock::ReflowAbsoluteFrame(). r=dholbert

The only caller (nsAbsoluteContainingBlock::Reflow()) declares
nsReflowStatus before passing it in. Add an assertion to record this
knowledge.

MozReview-Commit-ID: 8M3Oi38nDyG

--HG--
extra : rebase_source : 296239e3cdbf74e9dc19d3c89e7ecdb68b13e4d4

layout/generic/nsAbsoluteContainingBlock.cpp

@@ -630,6 +630,8 @@ nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame*                aDelegat
                                                nsReflowStatus&          aStatus,
                                                nsOverflowAreas*         aOverflowAreas)
 {
+  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
+
 #ifdef DEBUG
   if (nsBlockFrame::gNoisyReflow) {
     nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent);