Add policy management for on-screen keyboard.

chrome/test/data/policy/policy_test_cases.json

Index: chrome/test/data/policy/policy_test_cases.json
diff --git a/chrome/test/data/policy/policy_test_cases.json b/chrome/test/data/policy/policy_test_cases.json
index 06a2957bdc06d7832dca4de35c37cb64d53077e9..d21cdae9849d2e3a9d172dd465c4e3383aef09e7 100644
--- a/chrome/test/data/policy/policy_test_cases.json
+++ b/chrome/test/data/policy/policy_test_cases.json
@@ -1922,6 +1922,18 @@
     ]
   },
 
+  "VirtualKeyboardEnabled": {
+    "os": ["chromeos"],
+    "test_policy": { "VirtualKeyboardEnabled": true },
+    "pref_mappings": [
+      { "pref": "settings.a11y.virtual_keyboard",
+        "indicator_tests": [
+          { "policy": { "VirtualKeyboardEnabled": true } }
+        ]
+      }
+    ]
+  },
+
   "AttestationEnabledForUser": {
     "os": ["chromeos"],
     "test_policy": { "AttestationEnabledForUser": true },
@@ -2144,6 +2156,9 @@
   "DeviceLoginScreenDefaultScreenMagnifierType" : {
   },
 
+  "DeviceLoginScreenDefaultVirtualKeyboardEnabled" : {
+  },
+
   "UptimeLimit": {
   },