Add audio capture to WebRtcGetDisplayMediaBrowserTest

This CL adds more tests to WebRtcGetDisplayMediaBrowserTest covering audio cases.

Bug: 896333
Change-Id: I6124237ceb43d18c3e3ecf9f2adc59b86952c19a
Reviewed-on: https://chromium-review.googlesource.com/c/1450853
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629778}
3 files changed