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This is a two-sided patch and will break downstream clank until the following is landed:
https://chrome-internal-review.googlesource.com/c/clank/internal/apps/+/2473783

There are no changes to this reland. The fix for the original revert is
in the other patch linked above.

This is a reland of da0bf646

Original change's description:
> Rename CopylessPaste to DocumentMetadata to reuse the class for other purposes
>
> Bug: 1044244
> Change-Id: I7af8208b8c5a25f247b09cc0cbe55d44934f1d2d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020604
> Reviewed-by: Becca Hughes <beccahughes@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Commit-Queue: Sam Bowen <sgbowen@google.com>
> Cr-Commit-Position: refs/heads/master@{#735612}

TBR=dcheng@chromium.org,haraken@chromium.org

Bug: 1044244
Change-Id: I5348c86f79e39539d21956f82981a3e6d49d7009
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026409Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Sam Bowen <sgbowen@google.com>
Cr-Commit-Position: refs/heads/master@{#736439}