GitLab

This reverts commit 3480cbb1.

Reason for revert: This caused some performance/memory regressions that
are far larger than expected.

Original change's description:
> [Paint Preview] Pre-warm compositor
> 
> This CL adds the ability to pre-warm a compositor process for use by
> paint preview show-on-startup.
> 
> 1. The compositor is started when native is initialized if the
>    experiment is enabled.
> 2. Depending on the situation the compositor is then used or killed.
>    a. Compositor is used: disconnect handler is updated and it is used
>       as if there was a compositor already.
>    b. Compositor is not used: the process is killed immediately.
> 
> This moves initialization of the compositor service up to O(100 ms)
> earlier (in local tests).
> 
> Bug: 1126180
> Change-Id: I1e6f627403e8c020b6551c510ad908bba0fc24a2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398562
> Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
> Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#805317}

TBR=mahmoudi@chromium.org,ckitagawa@chromium.org

Change-Id: I7cd5067906f3833f9d927f9b3be1fe2600dbb741
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1126180, 1126665, 1126734, 1126728, 1126648
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2403389Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805718}