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 a886d4aa434673ad5d0221c40a6f95ac7b93988d..73690385f7cd757b2d5c7e6a14d24b71072ef3bd 100644
--- a/chrome/test/data/policy/policy_test_cases.json
+++ b/chrome/test/data/policy/policy_test_cases.json
@@ -2598,6 +2598,30 @@
     ]
   },
 
+  "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": false },
+    "pref_mappings": [
+      { "pref": "pin_unlock_allow_weak_pins"}
+    ]
+  },
+
   "ArcCertificatesSyncMode": {
     "os": ["chromeos"],
     "can_be_recommended": false,