Roll external/skia 98385ba6c..c1a2ea33a (14 commits)

https://skia.googlesource.com/skia.git/+log/98385ba6c..c1a2ea33a

2019-02-06 halcanary@google.com bin/gn format gn/skia.gni
2019-02-06 herb@google.com Remove the distinction between key and device descriptors
2019-02-06 bungeman@google.com Roll HarfBuzz
2019-02-06 halcanary@google.com SkLoadICU: simplify
2019-02-06 robertphillips@google.com Move GrContextPriv methods to their own .cpp file
2019-02-06 mtklein@google.com add mad() and shuffle() to SkVx
2019-02-06 csmartdalton@google.com Add a GpuGM class for GPU-only tests
2019-02-06 mtklein@google.com fill in most remaining skvx operations
2019-02-06 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-02-06 herb@google.com Remove filterRec bypass on MakeRecAndEffects
2019-02-06 rmistry@google.com Have the RecreateSKPs bot upload to partner bucket
2019-02-06 herb@google.com Reorganize MakeRecAndEffects and SkScalerContext ctor
2019-02-06 reed@google.com per-contour variant of SkPathMeasure
2019-02-06 rmistry@google.com Remove PerCommit-Bookmaker

The AutoRoll server is located here: https://autoroll-internal.skia.org/r/android-master-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

Test: Presubmit checks will test this change.
Change-Id: I23436d8a0e6495366cf9a28db628773ad29fe74c
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.