Add the fieldtrial config for UrgentDiscardingFromPerformanceManager

Bug: 1030399
Change-Id: Iae8a083d00e95c4214e360303f30bd2d7dea45e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056107
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Auto-Submit: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742266}

testing/variations/fieldtrial_testing_config.json

@@ -5305,31 +5305,6 @@
             ]
         }
     ],
-    "ProactiveTabFreezeAndDiscard": [
-        {
-            "platforms": [
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "params": {
-                        "HighLoadedTabCount": "1000",
-                        "ShouldPeriodicallyUnfreeze": "true",
-                        "ShouldProactivelyDiscard": "false",
-                        "ShouldProtectTabsSharingBrowsingInstance": "true"
-                    },
-                    "enable_features": [
-                        "ProactiveTabFreezeAndDiscard",
-                        "stop-non-timers-in-background"
-                    ]
-                }
-            ]
-        }
-    ],
     "ProactivelySwapBrowsingInstance": [
         {
             "platforms": [
@@ -7181,6 +7156,21 @@
             ]
         }
     ],
+    "UrgentDiscardingFromPerformanceManager": [
+        {
+            "platforms": [
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled_20200129",
+                    "enable_features": [
+                        "UrgentDiscardingFromPerformanceManager"
+                    ]
+                }
+            ]
+        }
+    ],
     "UseFluentLanguageModel": [
         {
             "platforms": [