Roll external/skia ab99c3456..e728f676d (7 commits)
https://skia.googlesource.com/skia.git/+log/ab99c3456..e728f676d
2018-01-17 egdaniel@google.com Update to GrBackendTexutreImageGenerator to support lazy texture proxies
2018-01-17 scroggo@google.com Add a GM and images to test SkEncodedOrigin
2018-01-17 jvanverth@google.com Support scaled color emojis for SDF fallback
2018-01-17 kjlubick@google.com No SRGB for Chromecasts
2018-01-17 egdaniel@google.com Add ability for lazy proxy callback to free captured resources
2018-01-17 bsalomon@google.com Add macro to disable using GrTextureOp for AA in Chrome
2018-01-17 kjlubick@google.com Enable SRGB config on Chromecast
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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
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Change-Id: I6296dcadc7e55e3c6f08082c127b6252c4e04a08
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