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These extensions were being exposed as requestable but failing to
initialize because they weren't requested.

Allow GL_OES_compressed_ETC1_RGB8_texture in all cases when the driver
supports it.  ANGLE has been updated to only expose this extension with
native support.

TBR=kbr@chromium.org

BUG=angleproject:3675
BUG=983142
BUG=983750

Change-Id: Idb4b20638990432d3526d5559396a695fc814b31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1702765
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678394}