GitLab

CrasAudioClientStubImpl has some fake-ish behavors
(ex. SetAudioNodesForTesting). Besides other similar classes in the
directory are named FakeWhateverClient.

BUG=309506
TEST=none

Review URL: https://codereview.chromium.org/675403002

Cr-Commit-Position: refs/heads/master@{#301377}