Roll external/skia e45a83d7a..a1bded9a4 (12 commits)

https://skia.googlesource.com/skia.git/+log/e45a83d7a..a1bded9a4

2018-12-14 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 dfaccbc08abb..a7af56be7a6c (3 commits)
2018-12-14 bsalomon@google.com Fix stroked round capped circular arc batched with filled circle.
2018-12-14 bungeman@google.com CG smoothing implies gamma blit.
2018-12-14 kjlubick@google.com [canvaskit] Canvas API for loading fonts
2018-12-14 kjlubick@google.com [canvaskit] Expose setVolatile (especially for animations)
2018-12-14 benjaminwagner@google.com Add another NVIDIA LSAN suppression.
2018-12-14 bsalomon@google.com Reduce the number of backend->pixelconfig GrCaps virtuals.
2018-12-14 kjlubick@google.com Avoid system fonts when fuzzing
2018-12-14 caryclark@skia.org protect against fuzz generated fLastMoveToIndex
2018-12-14 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 828c59462fc1..dfaccbc08abb (1 commits)
2018-12-14 jvanverth@google.com Add new method for calculating text atlas sizes
2018-12-14 skia-bookmaker@skia-swarming-bots.iam.gserviceaccount.com Update markdown files

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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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Bug: 119394958
Change-Id: Ie72b7c8aa2debc533a986da7134af7af467fe193