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When a test command is specified, the run_cros_vm_test will run the vm
sanity test. This test is baked into the VM and smoke checks the system
browser by loading empty pages and running some simple javascript.

Since it depends on the system browser, we need to first deploy a locally
built Chrome to the VM (via the --deploy arg). The deploy script needs to
know the gn args that built the browser to know which libs to copy over.
Since we don't have the full set of args at test-time, give it a dummy
set of args to trigger the default deploying behavior.

Bug: 832374
Change-Id: I84f7fdd94672fcb220eaa4d9625395c1d0ab7636
Reviewed-on: https://chromium-review.googlesource.com/1050981
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558372}