Bug 882027. Make MediaDecoder::UpdateReadyStateForData always be responsible for calling GetNextFrameStatus when that value is passed to HTMLMediaElement::UpdateReadyStateForData, but keep calling GetNextFrameStatus on the state machine thread to suppress dispatching of redundant runnables when nothing has changed. r=cpearce

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extra : rebase_source : 88398541574bfb7590412bdd06438ab4e664e3bd
Bug 875060. Make display:-moz-stack/-moz-inline-stack elements which are overflow:hidden clip all their descendants, including those for which it is not the containing block. r=mats

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extra : rebase_source : 3c250648afa445e3bf6f4227fd1bd4c837f3e18d
Bug 876092. Copy the DisplayItemClip into OutOfFlowDisplayData instead of storing a pointer. r=mats

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extra : rebase_source : d941179d66854ab98b9f0aba40d33b534e69378e