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..65a9012f262855da6c299b9d7679bb4246e18c58 100644
--- a/chrome/common/extensions/api/passwords_private.idl
+++ b/chrome/common/extensions/api/passwords_private.idl
@@ -39,6 +39,9 @@ namespace passwordsPrivate {
     DOMString plaintextPassword;
   };
 
+  callback passwordListCallback = void(PasswordUiEntry[] entries);

[Devlin, 2016/04/20 22:32:52]

nitty nit: prefer PasswordListCallback (start with capital for types like this,
lowercase for functions and properties)

[hcarmona, 2016/04/20 23:10:58]

Done.

+  callback exceptionListCallback = void(DOMString[] exceptions);
+
   interface Functions {
     // Removes the saved password corresponding to |loginPair|. If no saved
     // password for this pair exists, this function is a no-op.
@@ -56,10 +59,21 @@ namespace passwordsPrivate {
     // 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.
+    // TODO(hcarmona): Investigate using a callback for consistency.
     //
     // |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 |callback|.

[Devlin, 2016/04/20 22:32:52]

nit: remove "using |callback|".  It's clear from the line below.

[hcarmona, 2016/04/20 23:10:58]

Done.

+    //

[Devlin, 2016/04/20 22:32:52]

nit: remove

[hcarmona, 2016/04/20 23:10:58]

Done.

+    // |callback|: Called with the list of saved passwords.
+    static void getSavedPasswordList(passwordListCallback callback);
+
+    // Returns the list of password exceptions using |callback|.
+    //

[Devlin, 2016/04/20 22:32:52]

(Same nits as above)

[hcarmona, 2016/04/20 23:10:58]

Done.

+    // |callback|: Called with the list of password exceptions.
+    static void getPasswordExceptionList(exceptionListCallback callback);
   };
 
   interface Events {