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These headers are intended to be consumed by tests only, not by
production code and thus should not be listed in service_sources target.

This makes the following errors disappear:

ERROR at //gpu/command_buffer/service/gpu_scheduler_mock.h:9:11: Include
not allowed.
          ^----------------------------------
It is not in any dependency of
//gpu/command_buffer/service:service_sources
The include file is in the target(s):
//testing/gmock:gmock
which should somehow be reachable.

ERROR at //gpu/command_buffer/service/mocks.h:22:11: Include not allowed.
          ^----------------------------------
It is not in any dependency of
//gpu/command_buffer/service:service_sources
The include file is in the target(s):
//testing/gmock:gmock
which should somehow be reachable.

Tested on Linux with the following command lines:

$ gn gen out-gn/Debug
$ gn check out-gn/Debug //gpu/command_buffer/service/*

BUG=367595,376000
TEST=see above
R=sievers@chromium.org

Review URL: https://codereview.chromium.org/1114633003

Cr-Commit-Position: refs/heads/master@{#327384}