CrOS: Add field trial testing config for minfilelistkb

BUG=chromium:1014871

Change-Id: I25e48d51150e9d4291a98fb7e68fa7319e5de734
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001722Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Brian Geffon <bgeffon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731811}

testing/variations/fieldtrial_testing_config.json

@@ -1857,6 +1857,25 @@
             ]
         }
     ],
+    "CrOSMinFilelistKb": [
+        {
+            "platforms": [
+                "chromeos"
+            ],
+            "experiments": [
+                {
+                    "name": "MinFilelist0MbLockedBrowserText",
+                    "params": {
+                        "CrOSMinFilelistMb": "0"
+                    },
+                    "enable_features": [
+                        "CrOSHugepageRemapAndLockInZygote",
+                        "CrOSTuneMinFilelist"
+                    ]
+                }
+            ]
+        }
+    ],
     "CrOSSystemAECDeactivatedGroups": [
         {
             "platforms": [