Add bool code_coverage flag argument for BuildTargetUnitTestRequest.

Add a boolean code_coverage flag argument for calls to
BuildTargetUnitTestRequest to get the right handling to occur on the
backend without requiring direct use flag manipulation in the client
recipe.

BUG=b:161462144
TEST=./generate.sh

Change-Id: I4e45bf6709165b4201b3a7ee2f3cd3e394508eff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2321369
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: David Burger <dburger@chromium.org>
Tested-by: David Burger <dburger@chromium.org>
2 files changed