[Bugfix] Make Scrim absorb context clicks

- Currently, users can perform context clicks on views behind the
	Scrim.
- This makes context clicks on the scrim a no-op.
- This is done by setting the scrim context clickable and adding
	a listener that absorbs context clicks upon it.

Bug: 446222441
Change-Id: Ie53b6ac5de75321a20da5a92e91e6e4f497f933a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6976724
Auto-Submit: Fiaz Muhammad <mfiaz@google.com>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1519444}