Add regression test for Google Home scrubber fix
Add regression test for Google Home scrubber fix

The fix for Google Home scrubber in 8c3775ce (Change-Id
Iceec95f18cf15325b7ee2350a0f30f31edc90560) did not come with a
regression test.  This change covers that fix with an automated test.

I have confirmed that the test fails without the fix.

Issue #2606

Change-Id: I13a2bcfb2fcca059db4e909d7c27fb68b0bfb409

shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player