Roll external/skia ea1b30b57b7b..e5b65d212bca (1 commits)

https://skia.googlesource.com/skia.git/+log/ea1b30b57b7b..e5b65d212bca

2019-09-19 halcanary@google.com pdf-comparison and image_diff_metric tools

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 nifong@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: I8a94910c93c2023f4f1febd95b04d4b8df3d9eaa
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.