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Putting parameters in a struct like this will make it easier to change
parameters going forward, as it should be less necessary to update
implementations that don't care about certain parameters.

This CL also adds processing configuration as a new, optional
audio source parameter to this struct. It is used to configure audio
processing when it's supported directly in the source, as will be the
case in the audio service.

For an outline of the project this CL is part of, see: https://docs.google.com/document/d/1u4POff_ts_1LE3WDLA_wDDFnUswdlsuHL5DsiTE0a3U/edit?usp=sharing
It's accessible to everyone @chromium.org.

Bug: 851959

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: Ibdcddf1bfc741467dcab68776872c6fcda0f43ad
Reviewed-on: https://chromium-review.googlesource.com/1167849
Commit-Queue: Oskar Sundbom <ossu@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584025}