Bug 811024 part 1: Teach nsCSSFrameConstructor how to split a flex container. r=mats
Bug 811024 part 2: Split vertical flex containers whose main size (height) is larger than available height. r=mats
Bug 811024 part 3: Split horizontal flex containers whose cross size (height) is larger than available height (and refactor cross-size computation). r=mats
Bug 811024 part 4: Don't ask for bottom border/padding space on a flex container if it's going to get a continuation. r=mats
Bug 811024 part 5: reftests for fragmenting empty flex containers, with various margin/border/padding. r=mats
Bug 811024 part 6: reftests for fragmenting flex containers that contain a single unbreakable child. r=mats

--HG--
rename : layout/reftests/flexbox/pagination/flexbox-empty-1a.html => layout/reftests/flexbox/pagination/flexbox-unbreakable-child-1a.html
rename : layout/reftests/flexbox/pagination/flexbox-empty-1a.html => layout/reftests/flexbox/pagination/flexbox-unbreakable-child-1b.html
rename : layout/reftests/flexbox/pagination/flexbox-empty-1a.html => layout/reftests/flexbox/pagination/flexbox-unbreakable-child-1c.html
rename : layout/reftests/flexbox/pagination/flexbox-empty-1a.html => layout/reftests/flexbox/pagination/flexbox-unbreakable-child-1d.html