Add field trial config for InstallAmbientBadgeEngagement

Bug: 1418452
Change-Id: Iafaec8a4236de8207884e8939bb0707619e27b71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4357914
Reviewed-by: Glenn Hartmann <hartmanng@chromium.org>
Auto-Submit: Ella Ge <eirage@chromium.org>
Commit-Queue: Glenn Hartmann <hartmanng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1120037}

testing/variations/fieldtrial_testing_config.json

@@ -6944,6 +6944,27 @@
             ]
         }
     ],
+    "InstallAmbientBadgeEngagement": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled_Message_Engagement_5",
+                    "params": {
+                        "minimal_engagement": "5"
+                    },
+                    "enable_features": [
+                        "AmbientBadgeSiteEngagement"
+                    ],
+                    "disable_features": [
+                        "AmbientBadgeSuppressFirstVisit"
+                    ]
+                }
+            ]
+        }
+    ],
     "InstallAndroidUnwindDfm": [
         {
             "platforms": [