Make access to color_space() agnostic of underlying type

Bug: webrtc:8651
Change-Id: Ic819f9264083b2ab99e7796b932f82e28af8c23b
Reviewed-on: https://chromium-review.googlesource.com/c/1344432
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Johannes Kron <kron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610013}
1 file changed