BUG=angleproject:1040
TEST=angle_end2end_tests,angle_perftests,WebGL

Change-Id: I72beaf7e178e042440337fbb8b9669638c5ad016
Reviewed-on: https://chromium-review.googlesource.com/289558Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>