GitLab

* Simplify CastComponent constructor to take a single structure.
* Spin-off from https://crrev.com/c/1770434

Bug: 976975
Change-Id: Icb42418bfa60e1b6f34bd3f29f1f1c29d754cf07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1778915
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692201}