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is enabled if the gn arg enable_video_with_mixed_audio is 'true'.

Bug: b/141625857
Test: Ran cast_shell locally
Change-Id: Ic61fa599cd6aa573b555df7ac25fab9358d61681
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874521Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Bryan Clark <bryanclark@google.com>
Cr-Commit-Position: refs/heads/master@{#708423}