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

chrome/common/extensions/api/passwords_private.idl

Index: chrome/common/extensions/api/passwords_private.idl
diff --git a/chrome/common/extensions/api/passwords_private.idl b/chrome/common/extensions/api/passwords_private.idl
index 1b1d0413119f3cc7024cac32f34689933874576f..d8a0461546adcae0926d0792add36e22422eae5b 100644
--- a/chrome/common/extensions/api/passwords_private.idl
+++ b/chrome/common/extensions/api/passwords_private.idl
@@ -60,6 +60,14 @@ namespace passwordsPrivate {
     // |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 {