Add a fieldtrial testing config for DistinctModuleDatabaseSequence

Bug: 943303
Change-Id: I7bcc5b787851409dc488811446cbbdca51963f5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1712947Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679820}

testing/variations/fieldtrial_testing_config.json

@@ -1803,6 +1803,21 @@
             ]
         }
     ],
+    "DistinctModuleDatabaseSequence": [
+        {
+            "platforms": [
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "DistinctModuleDatabaseSequence"
+                    ]
+                }
+            ]
+        }
+    ],
     "DownloadHomeMoreButton": [
         {
             "platforms": [