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This reverts commit fb7edd8c.

Reason for revert: Not the culprit!

Original change's description:
> Revert "Android: Remove OverlayPanel-based Preview Tab code"
> 
> This reverts commit 928037da.
> 
> Reason for revert: Speculative fix for a mysterious crash in
> Contextual Search when animating the Overlay.  Issue 1050431.
> 
> BUG=1050431
> 
> Original change's description:
> > Android: Remove OverlayPanel-based Preview Tab code
> > 
> > Now that Preview Tab is working on top of ThinWebView and BottomSheet,
> > this CL deletes the old implementation that based it on OverlayPanel.
> > 
> > Bug: 1043677
> > Change-Id: Icccc93cca3f09e9ae122b1e0dcb7537331136ac0
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032466
> > Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
> > Reviewed-by: David Trainor <dtrainor@chromium.org>
> > Reviewed-by: Donn Denman <donnd@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#739094}
> 
> TBR=dtrainor@chromium.org,donnd@chromium.org,yusufo@chromium.org,jinsukkim@chromium.org
> 
> # Not skipping CQ checks because original CL landed > 1 day ago.
> 
> Bug: 1043677
> Change-Id: I7c9fa71c3aba77e3e1c8938db8f1b9f7f28a2b22
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2049206
> Reviewed-by: Donn Denman <donnd@chromium.org>
> Commit-Queue: Donn Denman <donnd@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740156}

TBR=dtrainor@chromium.org,donnd@chromium.org,yusufo@chromium.org,jinsukkim@chromium.org

Change-Id: Ifbf3c03cc955bd942bfbcbf791cbddac8cf96e70
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1050431, 1043677
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050404Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740461}