Roll ANGLE b7bf742..4b97d50

https://chromium.googlesource.com/angle/angle.git/+log/b7bf742..4b97d50

BUG=chromium:639760
TEST=bots
TBR=jmadill@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2488313002
Cr-Commit-Position: refs/heads/master@{#431317}
1 file changed