Roll external/skia b41321b58..7bd58d96f (2 commits)

https://skia.googlesource.com/skia.git/+log/b41321b58..7bd58d96f

2018-12-11 michaelludwig@google.com Add additional test to blacklist for 405
2018-12-11 ethannicholas@google.com Perform Vulkan resets in a background thread

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: I386bd540840e1250bc6ecffe28f2ac42d40a7438
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.