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This reverts commit f8030cb2.

Reason for revert: crbug.com/1028641 - Breaks bottom toolbar hiding for the Duet experiment on Android.

Original change's description:
> viz: Remove unused bottom-controls data from compositor frame.
> 
> The bottom_controls_height and bottom_controls_shown_ratio fields
> in CompositorFrameMetadata are currently unused. Their usage has been
> replaced by the same fields in RenderFrameMetadata. So remove these
> fields.
> 
> BUG=none
> 
> Change-Id: I96af75cc5f933821cfb486fdeb1e314daa2a7030
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1927973
> Auto-Submit: Sadrul Chowdhury <sadrul@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#717874}

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

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: none
Change-Id: If66edb5c9184b8041c79dc9215bd725eb9f2cece
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940490Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719782}