Roll external/skia f1dd7a174..e7f8c3438 (2 commits)

https://skia.googlesource.com/skia.git/+log/f1dd7a174..e7f8c3438

2019-06-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 853ebacf99a4..c211c2f5b59d (17 commits)
2019-06-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src a2197be674d6..aad06d1d3342 (843 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: Ie27996bd31ca5744d42b67fd65a11114f8c094e6
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.