GitLab

Robolectric allows us to run tests that use Android code in the host
JVM. This means faster and more stable tests since we don't have to
deal with a device. This CL has the build file changes to build the
unit test suite, and two example tests that have been converted to
run with Robolectric.

BUG=448030

Review URL: https://codereview.chromium.org/994283006

Cr-Commit-Position: refs/heads/master@{#322512}