Bug 921495 - Make AlphaBoxBlur round correctly s. r=Bas
Bug 921495 - Add a test for shadow blur rounding.
Bug 921495 - Speed up blurring by processing and packing 16 pixels at a time. r=Bas
Bug 940854 - Unbreak unified gfx/harfbuzz on FreeBSD. r=BenWa

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extra : rebase_source : 793e44b6f3470213b7eaeb99825fe9320c5dd2fe