Autofill: Add fieldtrail testing for AndroidAutofillQueryServerFieldTypes

Bug: 1151542
Change-Id: I25545f36d588ca926ce1de9514ae919f3f441a64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628040
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843427}

testing/variations/fieldtrial_testing_config.json

@@ -112,6 +112,22 @@
             ]
         }
     ],
+    "AndroidAutofillQueryServerFieldTypes": [
+        {
+            "platforms": [
+                "android_weblayer",
+                "android_webview"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "AndroidAutofillQueryServerFieldTypes"
+                    ]
+                }
+            ]
+        }
+    ],
     "AndroidDarkSearch": [
         {
             "platforms": [