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For now, this capability is gated by the keyboard-enabled flag.

BUG=

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;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
Change-Id: I050b9dff9552ce3cff6c82f81296f4657d810ccf
Reviewed-on: https://chromium-review.googlesource.com/811064
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Yash Malik <ymalik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522258}