Bug 885424 part 0: Shift declarion of 'frameCrossSize' down to where it's actually used. r=dbaron
Bug 885424 part 1: Set aStatus at the very beginning of flexbox reflow, and call NS_FRAME_SET_TRUNCATION at the very end. r=dbaron
Bug 885424 part 2: Perform flexbox main-axis alignment separately from cross-size determination, to more closely match the ordering of steps in flexbox spec. r=dbaron
Bug 885424 part 3: Rename flexContainerMainSize to contentBoxMainSize, for clarity, and mark that & 'frameMainSize' as const. r=dbaron