Add field trial config for LoadingPredictorTableConfig

Bug: 1038703
Change-Id: I69653b606f593f2ecff4b6542d898885014efd90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057588
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741737}

testing/variations/fieldtrial_testing_config.json

@@ -3602,6 +3602,29 @@
             ]
         }
     ],
+    "LoadingPredictorTableConfig": [
+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled_300_10",
+                    "params": {
+                        "max_hosts_to_track": "300",
+                        "max_origins_per_entry": "10"
+                    },
+                    "enable_features": [
+                        "LoadingPredictorTableConfig"
+                    ]
+                }
+            ]
+        }
+    ],
     "LowPriorityAdProcesses": [
         {
             "platforms": [