Roll external/skia 6ce447a4e..537e62a21 (3 commits)
Roll external/skia 6ce447a4e..537e62a21 (3 commits)

https://skia.googlesource.com/skia.git/+log/6ce447a4e..537e62a21

2019-06-24 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 bf4cfa77c4bf..dfd760055152 (10 commits)
2019-06-24 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 31223069ea1d..91f69e5c58f5 (388 commits)
2019-06-24 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader a7edc1cd1d8f..900e1dac1b2d (2 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: I8e5713b42b69f943259bb5828d6f1d0550a25946
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.

aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia