Add PhysicalWeb to the fieldtrial testing config

Coverage set to "Enabled" for Android only.

BUG=529962

Review URL: https://codereview.chromium.org/1696473004

Cr-Commit-Position: refs/heads/master@{#375209}
diff --git a/testing/variations/fieldtrial_testing_config_android.json b/testing/variations/fieldtrial_testing_config_android.json
index a9214c0e..6cbbfdf 100644
--- a/testing/variations/fieldtrial_testing_config_android.json
+++ b/testing/variations/fieldtrial_testing_config_android.json
@@ -208,6 +208,11 @@
             "group_name": "SmartLockBrandingSavePromptOnly"
         }
     ],
+    "PhysicalWeb": [
+        {
+            "group_name": "Enabled"
+        }
+    ],
     "Precache": [
         {
             "group_name": "Enabled"