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

chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.h

Index: chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.h
diff --git a/chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.h b/chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.h
index 65e79fa1a08ee2ccb769c385473995241e37e1ee..afa361bb9af90579e59936056e255028c9a4e0c6 100644
--- a/chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.h
+++ b/chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.h
@@ -56,6 +56,23 @@ class QuickUnlockPrivateGetActiveModesFunction
   DISALLOW_COPY_AND_ASSIGN(QuickUnlockPrivateGetActiveModesFunction);
 };
 
+class QuickUnlockPrivateCheckCredentialFunction
+    : public UIThreadExtensionFunction {
+ public:
+  QuickUnlockPrivateCheckCredentialFunction();
+  DECLARE_EXTENSION_FUNCTION("quickUnlockPrivate.checkCredential",
+                             QUICKUNLOCKPRIVATE_ISCREDENTIALUSABLE);
+
+ protected:
+  ~QuickUnlockPrivateCheckCredentialFunction() override;
+
+  // ExtensionFunction overrides.
+  ResponseAction Run() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(QuickUnlockPrivateCheckCredentialFunction);
+};
+
 class QuickUnlockPrivateSetModesFunction : public UIThreadExtensionFunction,
                                            public chromeos::AuthStatusConsumer {
  public: