[omnibox] Add field trial config for OmniboxOnFocusZps.

Change-Id: I997fb91ec65195fd66ce2744d6f163ef22b85c95
Bug: 403349190
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6475827
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Nihar Majmudar <niharm@google.com>
Cr-Commit-Position: refs/heads/main@{#1451132}

testing/variations/fieldtrial_testing_config.json

@@ -16201,6 +16201,34 @@
             ]
         }
     ],
+    "OmniboxOnFocusZPS": [
+        {
+            "platforms": [
+                "chromeos",
+                "chromeos_lacros",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled_6_Suggestions",
+                    "params": {
+                        "OnFocusMaxSearchSuggestions": "3",
+                        "OnFocusMaxUrlSuggestions": "3",
+                        "OnFocusMostVisitedMaxSuggestions": "6"
+                    },
+                    "enable_features": [
+                        "HappinessTrackingSurveyForOmniboxOnFocusZps",
+                        "OmniboxFocusTriggersWebAndSRPZeroSuggest",
+                        "OmniboxHideSuggestionGroupHeaders",
+                        "OmniboxUrlSuggestionsOnFocus",
+                        "ZeroSuggestPrefetchingOnWeb"
+                    ]
+                }
+            ]
+        }
+    ],
     "OmniboxPrerender": [
         {
             "platforms": [