Roll external/skia b27a9cf2f..419709dbb (16 commits)
https://skia.googlesource.com/skia.git/+log/b27a9cf2f..419709dbb
2018-10-12 mtklein@google.com disable lowp raster pipeline stages in Flutter
2018-10-12 bsalomon@google.com Revert "Revert "Add experimental API to draw a set of SkImages in one SkCanvas call.""
2018-10-12 brianosman@google.com Tie mip map cache purging to Images, not Bitmaps/PixelRefs
2018-10-12 halcanary@google.com SkPDF: treat alpha as color component.
2018-10-12 brianosman@google.com Remove legacy makeColorSpace implementation
2018-10-12 halcanary@google.com SkDynamicMemoryWStream: optimize detachAsStream() for tiny streams
2018-10-12 egdaniel@google.com Have old GrBackend name still available.
2018-10-12 kjlubick@google.com Fix gold aggregator for pathkit
2018-10-12 brianosman@google.com Stop using color space xform canvas in picture image generator
2018-10-12 kjlubick@google.com Exercise entire public PathOp API
2018-10-12 bsalomon@google.com Reland "transform gradient colors without skcms"
2018-10-12 bsalomon@google.com Revert "Add experimental API to draw a set of SkImages in one SkCanvas call."
2018-10-12 bsalomon@google.com Revert "transform gradient colors without skcms"
2018-10-12 scroggo@google.com Test a GIF with an out of range transparent index
2018-10-12 egdaniel@google.com Move GrBackend enum to enum class.
2018-10-12 bsalomon@google.com Add experimental API to draw a set of SkImages in one SkCanvas call.
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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
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Change-Id: I95a75de3e45a737da81f81816fb1e2dbefa08c09
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