Roll external/skia 019791321..e7b1a13a1 (1 commits)

https://skia.googlesource.com/skia.git/+log/019791321..e7b1a13a1

2018-11-19 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 1c6b26a70f93..fde74c078f77 (1 commits)

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: I5bea9fe8a017a61165e40b312c533bd7ccc36921
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.