GitLab

This is the initial check-in of the feature to add ChromeDriver tests
to commit queue. It includes the following:

* A new test target chromedriver_py_tests, to encapsulate dependencies
  needed to run the Python-based ChromeDriver tests. This target is
  currently enabled on Linux only. Other platforms will be added later.

* Only a single test case is enabled. Enabling additional test cases
  will be done later.

Bug: 793370
Change-Id: I5a6f0568d2e78724a4fe53e84c3a480d770c3e47
Reviewed-on: https://chromium-review.googlesource.com/874816
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531234}