Add a mock vision-common GMS client target

Upcoming GMS versions will split the vision client into vision and
vision-common. In order to roll downstream, we must add an upstream
dependency on vision-common. But upstream is not yet ready to roll, so
we add a mock vision-common target to temporarily satisfy the new
dependency in upstream builds.

BUG=706943
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.mac:mac_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2888283002
Cr-Commit-Position: refs/heads/master@{#473268}
2 files changed