Add functions to the passwords private api that update the lists.

chrome/common/extensions/api/passwords_private.idl

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Use the <code>chrome.passwordsPrivate</code> API to add or remove password
 // data from the settings UI.
 namespace passwordsPrivate {
   // Pair of origin URL and login saved for that URL.
   dictionary LoginPair {
     // The human-readable origin for the URL where the password is used.
@@ skipping 42 matching lines @@
     static void removePasswordException(DOMString exceptionUrl);
 
     // Returns the plaintext password corresponding to |loginPair|. Note that on
     // some operating systems, this call may result in an OS-level
     // reauthentication. Once the password has been fetched, it will be returned
     // via the onPlaintextPasswordRetrieved event.
     //
     // |loginPair|: The LoginPair corresponding to the entry whose password
     //     is to be returned.
     static void requestPlaintextPassword(LoginPair loginPair);
+
+    // Returns the list of saved passwords using the
+    // |onSavedPasswordsListChanged| event.
+    static void requestSavedPasswordList();

[Devlin, 2016/04/16 00:41:49]

I thought we automatically sent these when a listener was added?

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/ext...

[Devlin, 2016/04/16 00:43:34]

I guess I should have looked at part 2 of this series.  My bad.

If we're going to do this, let's have a getSavedPasswordList that takes a
callback, rather than forcing an event occurrence.

[stevenjb, 2016/04/18 18:48:18]

I agree. The signature can match that of the event so that the same JS function
can be passed to both the listener and the explicit request. That is a common
pattern in other extension APIs.

+
+    // Returns the list of password exceptions using the
+    // |onPasswordExceptionsListChanged| event.
+    static void requestPasswordExceptionList();
   };
 
   interface Events {
     // Fired when the saved passwords list has changed, meaning that an entry
     // has been added or removed. Note that this event fires as soon as a
     //  listener is added.
     //
     // |entries|: The updated list of password entries.
     static void onSavedPasswordsListChanged(PasswordUiEntry[] entries);
 
     // Fired when the password exceptions list has changed, meaning that an
     // entry has been added or removed. Note that this event fires as soon as a
     // listener is added.
     //
     // |exceptions|: The updated list of password exceptions.
     static void onPasswordExceptionsListChanged(DOMString[] exceptions);
 
     // Fired when a plaintext password has been fetched in response to a call to
     // chrome.passwordsPrivate.requestPlaintextPassword().
     //
     // |loginPair|: The LoginPair whose password was found.
     // |plaintextPassword|: The plaintext password which was retrieved.
     static void onPlaintextPasswordRetrieved(
         PlaintextPasswordEventParameters dict);
   };
 };