Roll ANGLE 8d95b74..ad0a486.

Also includes new platform impl methods and histogram update.

https://chromium.googlesource.com/angle/angle/+log/8d95b74..ad0a486

BUG=436191,468852,477701

Review URL: https://codereview.chromium.org/1090493003

Cr-Commit-Position: refs/heads/master@{#326287}
4 files changed