Roll external/skia ce200acafa7a..cdc0c23f1a2e (3 commits)

https://skia.googlesource.com/skia.git/+log/ce200acafa7a..cdc0c23f1a2e

2019-11-05 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-11-05 reed@google.com split out blendmodes for skvm
2019-11-05 reed@google.com split out serial functions for SkFont into separate impl

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://skia-autoroll.corp.goog/r/android-master-autoroll
Please CC stani@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

Test: Presubmit checks will test this change.
Change-Id: Ic178961dad0655c04e52db9c1f4233ef5a4e677a
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.