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The autogenerated service side tests are sharded out. New extensions
were added and those tests spilled over into a new shard 4.  However,
there was no driver for the 4th shard and these tests were never run.

This CL does 2 things:

(1) adds a simple driver so that any new autogen tests in the 4th shard
will be run

(2) disables the service side tests for the CHROMIUM extensions

Bug: none
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: Ibb3fbb89a6fd648804559d3c7be2cb946db7f4ba
Reviewed-on: https://chromium-review.googlesource.com/886648
Commit-Queue: Jonathan Backer <backer@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531957}