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This ensures that it interacts properly with other renderers. If we
render the keyboard directly, it won't flush previously-queued work, and
elements may draw out of order.

BUG=815078
R=ymalik

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Id691fea5a5a0bbbbe5f8e6d56b0ed2c33b0a8b59
Reviewed-on: https://chromium-review.googlesource.com/934981
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Yash Malik <ymalik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538890}