Bug 890716. Fix race in Reverb::Reverb. r=padenot

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extra : rebase_source : 65af577f5ffcf7f7a0b650f1693f4159ddac4ac6
Bug 885009. Handle clip-all-descendants cases with rounded corners. r=mats

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extra : rebase_source : 284587e5fa70532bc6435f987f03c1282edc9cb8
Bug 837242. Part 1: Convert bool parameters to flags. r=mats

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extra : rebase_source : e59fe41c41f2be6b4f0c78528cf954093f3011bd