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 f66293ea588f72c860ce0083270cb281f955cd49..3a028efafa06eb82cee666116d3e95da95c8b352 100644
--- a/chrome/test/data/policy/policy_test_cases.json
+++ b/chrome/test/data/policy/policy_test_cases.json
@@ -2578,6 +2578,30 @@
     ]
   },
 
+  "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,