Wire up the Chrome Sign In modal dialog from the password bubble promo.

chrome/browser/ui/passwords/manage_passwords_ui_controller.cc

Index: chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
diff --git a/chrome/browser/ui/passwords/manage_passwords_ui_controller.cc b/chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
index e1b9ea854d6f7adaa73ff3ac7367cda3b2c261e0..e75fb92fd3b7bdf775641485e1c5a58947c36dc0 100644
--- a/chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
+++ b/chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
@@ -333,7 +333,11 @@ void ManagePasswordsUIController::NavigateToPasswordManagerSettingsPage() {
 }
 
 void ManagePasswordsUIController::NavigateToChromeSignIn() {
-  // TODO(http://crbug.com/615825): do the job.
+  Browser* browser = chrome::FindBrowserWithWebContents(web_contents());
+  browser->window()->ShowAvatarBubbleFromAvatarButton(
+      BrowserWindow::AVATAR_BUBBLE_MODE_SIGNIN,
+      signin::ManageAccountsParams(),
+      signin_metrics::AccessPoint::ACCESS_POINT_PASSWORD_BUBBLE);
 }
 
 void ManagePasswordsUIController::OnDialogHidden() {