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

chrome/common/extensions/api/quick_unlock_private.idl

Index: chrome/common/extensions/api/quick_unlock_private.idl
diff --git a/chrome/common/extensions/api/quick_unlock_private.idl b/chrome/common/extensions/api/quick_unlock_private.idl
index c3121beffcaf4e61c5d7148737a66a8e72b6f317..d07a27b542a7253b6e5c9d38a58e6e06e09ec865 100644
--- a/chrome/common/extensions/api/quick_unlock_private.idl
+++ b/chrome/common/extensions/api/quick_unlock_private.idl
@@ -19,8 +19,30 @@ namespace quickUnlockPrivate {
     PIN
   };
 
+  // The problems a given PIN might have.
+  enum CredentialProblem {
+    TOO_SHORT,
+    TOO_LONG,
+    TOO_WEAK,
+    CONTAINS_NONDIGIT
+  };
+
+  dictionary CredentialCheck {
+    // The given PINs errors. Users cannot proceed with an error.
+    CredentialProblem[] errors;
+    // THe given PINs warnings. Users can, but are not advised to proceed with
+    // a warning.
+    CredentialProblem[] warnings;
+    // The minimum allowed length for a PIN.
+    long minLength;
+    // The maximum allowed length for a PIN. A value of 0 indicates no maximum
+    // length.
+    long maxLength;
+  };

[stevenjb, 2016/11/30 18:13:58]

It seems a little awkward to me that we return the min/max pin length along with
the credential check result. It seems like the UI might want to request that
information independently (e.g. to prevent submitting an invalid pin).

Maybe add a getCredentialRequirements method instead and just provide the
min/max length there?

[sammiequon, 2016/11/30 23:03:42]

Done.

+
   callback BooleanResultCallback = void (boolean value);
   callback ModesCallback = void (QuickUnlockMode[] modes);
+  callback CredentialCheckCallback = void (CredentialCheck check);
 
   interface Functions {
     // Returns the set of quick unlock modes that are available for the user to
@@ -31,6 +53,17 @@ namespace quickUnlockPrivate {
     // the lock screen.
     static void getActiveModes(ModesCallback onComplete);
 
+    // Checks if the given credential can be used for the given unlock mode.
+    // Enterprise policy can change credential requirements.
+    // |mode|: The quick unlock mode that is used.
+    // |credential|: The given credential.
+    // |onComplete|: Called with a list of warnings and errors the given
+    // |credential| has (if any). Allow provides extra information needed to be
+    // displayed.
+    static void checkCredential(QuickUnlockMode mode,
+                                DOMString credential,
+                                CredentialCheckCallback onComplete);
+
     // Update the set of quick unlock modes that are currently active/enabled.
     // |accountPassword|: The password associated with the account (e.g. the
     // GAIA password). This is required to change the quick unlock credentials.