Reland "Re-add field trial testing config for DisableLatencyRecoveryDesktop"

This reverts commit 873b558a.

Reason for revert: The reverted CL does not seem to be in the range for
the failure, but apparently detected as the culprit by sheriff-o-matic.
Relanding to see if the failure repros again.

Original change's description:
> Revert "Re-add field trial testing config for DisableLatencyRecoveryDesktop"
>
> This reverts commit 26f4c62b.
>
> Reason for revert: chromeos-eve-chrome build failures
>
> Original change's description:
> > Re-add field trial testing config for DisableLatencyRecoveryDesktop
> >
> > Based on the data gathered from running the experiment on canary/dev and
> > beta, it seems that the disabling latency recovery for both main and
> > impl threads is an overall performance win. So, we are going to
> > re-enable the (now-expired) experiment on stable and move forward with
> > its gradual rollout.
> >
> > Bug: 993895
> > Change-Id: I5c45c3cb469d14cf53193d0af6a560842ce02be2
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309188
> > Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> > Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#790549}
>
> TBR=mohsen@chromium.org,rkaplow@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: 993895, 1113101
> Change-Id: Ibfebd16583e4f4670d808b80eb00360f0e744ce0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2338214
> Reviewed-by: Aya Elsayed <ayaelattar@chromium.org>
> Commit-Queue: Aya Elsayed <ayaelattar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#794951}

TBR=mohsen@chromium.org,rkaplow@chromium.org,ayaelattar@chromium.org

# Not skipping CQ checks because this is a reland.

Bug: 993895
Bug: 1113101
Change-Id: Id2b1108ebe66938f76c3b60370f5dd3f9681a932
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339594Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795031}

testing/variations/fieldtrial_testing_config.json

@@ -2242,6 +2242,25 @@
             ]
         }
     ],
+    "DisableLatencyRecoveryDesktop": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "DisabledImplDisabledMain",
+                    "disable_features": [
+                        "ImplLatencyRecovery",
+                        "MainLatencyRecovery"
+                    ]
+                }
+            ]
+        }
+    ],
     "DisableMalwareExtensionsRemotely": [
         {
             "platforms": [