cros: Added a new function to quick unlock api for checking unfinished pins.

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 229aaca4c1c91e2ce5e1bcb99303b1ba5d2ef6b9..3b69a28a8d2bae7312c9214da738f00128305d16 100644
--- a/chrome/test/data/policy/policy_test_cases.json
+++ b/chrome/test/data/policy/policy_test_cases.json
@@ -2635,6 +2635,30 @@
     ]
   },
 
+  "PinUnlockMinimumLength": {
+    "os": ["chromeos"],
+    "test_policy": { "PinUnlockMinimumLength": 4 },
+    "pref_mappings": [
+      { "pref": "pin_unlock_minimum_length"}
+    ]
+  },
+
+  "PinUnlockMaximumLength": {
+    "os": ["chromeos"],
+    "test_policy": { "PinUnlockMaximumLength": 0 },
+    "pref_mappings": [
+      { "pref": "pin_unlock_maximum_length"}
+    ]
+  },
+
+  "PinUnlockAllowWeakPins": {
+    "os": ["chromeos"],
+    "test_policy": { "PinUnlockAllowWeakPins": true },
+    "pref_mappings": [
+      { "pref": "pin_unlock_allow_weak_pins"}
+    ]
+  },
+
   "ArcCertificatesSyncMode": {
     "os": ["chromeos"],
     "can_be_recommended": false,