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This CL adds OutputSurface::Capabilities::supports_dc_video_overlays. In
a previous CL I added supports_dc_layers. This only indicates the
support for direct composition though, not direct composition video
overlays, so a second flag is necessary.

Bug: 1007055
Change-Id: I8b916f3051c595b3be98d639b26c04ac23bb977d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822018
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699482}