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This is a reland of 88733983

Switching the triggering to onPageLoadFinished() from onHidden() as
onHidden() was flaky due to renders going away. We will want to revist
this triggering behavior in a follow up.

> Previously reverted due to: crbug/1061952

> The onHidden() trigger appears to be flaky due to Renders going away
> too soon. Going to have to re-land with either a different test or
> alternative triggering option...

Original change's description:
> [Paint Preview] Tab Service Java side
>
> This CL implements the Java side integration for the TabService.
>
> Bug: 1058093
> Change-Id: Iaa8f007a2a16ac10f87466eb7d5d49f05e112576
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090298
> Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
> Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#750542}

Bug: 1058093
Change-Id: I269ff0ebb8372255d5c0c69a2d9f9bfa886e5838
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106258Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750944}