Testability and the multiplier effect:
Testability, especially for the Google apps teams, external third parties, and even internally has been an issue in the past.
The test team partners with the accessibility, Android, and Webdriver teams to accelerate testability and make Chrome officially supported on Chrome OS.
This improves test automation productivity within the team for the Google apps teams. This also has the ultimate benefit of making Chrome the ideal platform for testing other applications for third-party web pages.