Declare the ServiceWorkerServicification experiment for fieldtrial testing.

This experiment is ready for testing on the Beta channel.

Bug: 846235
Change-Id: Ibcaafcab93fced86a2831b6c7cb53b02bbc869db
Reviewed-on: https://chromium-review.googlesource.com/1147891Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579610}

testing/variations/fieldtrial_testing_config.json

@@ -3780,6 +3780,25 @@
             ]
         }
     ],
+    "ServiceWorkerServicification": [
+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "ServiceWorkerServicification"
+                    ]
+                }
+            ]
+        }
+    ],
     "SettingsEnforcement": [
         {
             "platforms": [