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This CL adds support for an additional image with an optional subtitle. The image is rendered on top of full overlays only, and is anchored to the top such that viewport resizes do not affect its position.

See the linked bug for example screenshots.

Bug: b/143452916
Change-Id: Ic974b2e0f622edd2a917d1f2fe54b4a4ccd33949
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886851Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#711666}