[Passwords] Add addPassword to private API

Introduce passwordsPrivate.addPassword API, which will be called from
add password dialog in Desktop Settings.

Bug: 1236053
Change-Id: I3e3d286db9fe4cb563a5176acceb60a763fdd478
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3242642
Reviewed-by: Devlin <[email protected]>
Commit-Queue: Elizabeth Popova <[email protected]>
Cr-Commit-Position: refs/heads/main@{#935126}
NOKEYCHECK=True
GitOrigin-RevId: 06881ba16672f9ffadc12a415495643171cc1aae

closure_compiler/externs/passwords_private.js

@@ -130,6 +130,16 @@ chrome.passwordsPrivate.InsecureCredential;
  */
 chrome.passwordsPrivate.PasswordCheckStatus;
 
+/**
+ * @typedef {{
+ *   url: string,
+ *   username: string,
+ *   password: string,
+ *   useAccountStore: boolean
+ * }}
+ */
+chrome.passwordsPrivate.AddPasswordOptions;
+
 /**
  * Function that logs that the Passwords page was accessed from the Chrome
  * Settings WebUI.
@@ -338,6 +348,16 @@ chrome.passwordsPrivate.getPasswordCheckStatus = function(callback) {};
  */
 chrome.passwordsPrivate.getUrlCollection = function(url, callback) {};
 
+/**
+ * Saves a new password entry described by the given |options|. Invokes
+ * |callback| or raises an error depending on whether the operation succeeded.
+ * @param {!chrome.passwordsPrivate.AddPasswordOptions} options Details about a
+ *     new password and storage to be used.
+ * @param {function(): void=} callback The callback that gets invoked on
+ *     success.
+ */
+chrome.passwordsPrivate.addPassword = function(options, callback) {};
+
 /**
  * Fired when the saved passwords list has changed, meaning that an entry has
  * been added or removed.