Add field trial testing config for Lookalikes V2

Bug: 991726
Change-Id: I9083f49ea712cecd0f23d1c434c3d8d813d36137
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903749
Auto-Submit: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713540}

testing/variations/fieldtrial_testing_config.json

@@ -3249,6 +3249,28 @@
             ]
         }
     ],
+    "LookalikeUrlNavigationSuggestionsUIV2": [
+        {
+            "platforms": [
+                "linux",
+                "mac",
+                "windows",
+                "android",
+                "chromeos"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "params": {
+                        "topsites": "true"
+                    },
+                    "enable_features": [
+                        "LookalikeUrlNavigationSuggestionsUI"
+                    ]
+                }
+            ]
+        }
+    ],
     "LowPriorityIframes2": [
         {
             "platforms": [