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If there are no available inputs, PulseAudio will, for some reason,
select the monitor of the current default sink as the default source.
Chrome will only add a Default input to the device enumeration if
there is at least one valid input found. Currently, we also include
unavailable inputs in the device enumeration, which means Chrome will
show a Default device, which in that case would likely be a monitor
device, rather than a proper input.

This CL stops this happening by not enumerating inputs that don't have
an available, active port. In case PulseAudio would _still_ pick a
monitor device as the default device, this CL also explicitly returns
invalid AudioParameters for monitor devices, and explicitly fails to
open them as inputs - to be on the safe side.

Bug: b/79580580
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I25bd96e98a48bcdf6e993759e97bf713855d4ad0
Reviewed-on: https://chromium-review.googlesource.com/1064373
Commit-Queue: Oskar Sundbom <ossu@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562383}