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ANGLE now exposes this extension under the same conditions as Chrome: on top
of a native ES driver.

BUG=angleproject:1552

Change-Id: I6552e51bccd5ece43b7405b26d63127283a90c46
Reviewed-on: https://chromium-review.googlesource.com/c/1342497Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609713}