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This will make it easier to write tests and send events directly
to the dialog.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ib9a25666a213e1279a6491bd61331b4e7c8321e4
Reviewed-on: https://chromium-review.googlesource.com/1012917
Commit-Queue: Amirhossein Simjour <asimjour@chromium.org>
Reviewed-by: Yash Malik <ymalik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551008}