[Autofill] Add support for signin promo on Android

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 45e285a8ca204af27cdd37c2cb68ecdc35dc2b97..e78698f2eb98399983e39c40d8dd5090c9506e87 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -958,6 +958,8 @@
       'browser/android/signin/signin_investigator_android.h',
       'browser/android/signin/signin_manager_android.cc',
       'browser/android/signin/signin_manager_android.h',
+      'browser/android/signin/signin_promo_util_android.cc',
+      'browser/android/signin/signin_promo_util_android.h',
       'browser/android/tab_android.cc',
       'browser/android/tab_android.h',
       'browser/android/tab_state.cc',
@@ -2053,6 +2055,7 @@
       'android/java/src/org/chromium/chrome/browser/signin/OAuth2TokenService.java',
       'android/java/src/org/chromium/chrome/browser/signin/SigninInvestigator.java',
       'android/java/src/org/chromium/chrome/browser/signin/SigninManager.java',
+      'android/java/src/org/chromium/chrome/browser/signin/SigninPromoUtil.java',
       'android/java/src/org/chromium/chrome/browser/snackbar/smartlockautosignin/AutoSigninSnackbarController.java',
       'android/java/src/org/chromium/chrome/browser/spellchecker/SpellCheckerSessionBridge.java',
       'android/java/src/org/chromium/chrome/browser/superviseduser/SupervisedUserContentProvider.java',
@@ -2876,6 +2879,8 @@
       'browser/signin/signin_error_controller_factory.h',
       'browser/signin/signin_manager_factory.cc',
       'browser/signin/signin_manager_factory.h',
+      'browser/signin/signin_promo_util.cc',
+      'browser/signin/signin_promo_util.h',
       'browser/signin/signin_status_metrics_provider_chromeos.cc',
       'browser/signin/signin_status_metrics_provider_chromeos.h',
       'browser/signin/signin_tracker_factory.cc',