Bug 831768 part 2 - Also defer painting from RecvUpdateBackground just as we did with RecvAsyncSetWindow, r=gfritzsche

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extra : rebase_source : c5b2001b1c32b1be7d5718bb72ae956706d572a4
Bug 853810 - Add .POST to PSL. r=gerv.
Bug 827684 - Fix potential memory leak of OmxDecoder if Init fails on Android. r=doublec