Enable ANGLE ES3 by default in Chromium (Windows)

We can use --disable-es3-angle or driver bug workaround list to turn
it off if it's problematic on certain platforms.

BUG=649101
TEST=win bots
R=piman@chromium.org,kbr@chromium.org,geofflang@chromium.org
NOTRY=true
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2354423002
Cr-Commit-Position: refs/heads/master@{#420802}
5 files changed