Update DoH field trials test config

Bug: 878582,1087444
Change-Id: I46d852911322d1a246ec48ca45f61c18ff485de2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219016
Commit-Queue: Eric Orth <ericorth@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775166}

testing/variations/fieldtrial_testing_config.json

@@ -2012,14 +2012,31 @@
         {
             "platforms": [
                 "android",
-                "android_weblayer",
+                "android_weblayer"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled_crbug1006105",
+                    "enable_features": [
+                        "DnsOverHttps"
+                    ]
+                }
+            ]
+        }
+    ],
+    "DnsOverHttpsUi": [
+        {
+            "platforms": [
                 "chromeos",
                 "mac",
                 "windows"
             ],
             "experiments": [
                 {
-                    "name": "Enabled_crbug1006105",
+                    "name": "EnabledLaunch",
+                    "params": {
+                        "ShowUi": "true"
+                    },
                     "enable_features": [
                         "DnsOverHttps"
                     ]