[Password Manager] Show omnibox icon and anchored prompt once user start typing password

components/password_manager/core/browser/password_manager_driver.h

Index: components/password_manager/core/browser/password_manager_driver.h
diff --git a/components/password_manager/core/browser/password_manager_driver.h b/components/password_manager/core/browser/password_manager_driver.h
index af6551c4256a91ba8e5a5a6700bea56ffd7660b5..f48ea0c2abbe5c9b091321a399b26ab16e786954 100644
--- a/components/password_manager/core/browser/password_manager_driver.h
+++ b/components/password_manager/core/browser/password_manager_driver.h
@@ -78,6 +78,14 @@ class PasswordManagerDriver
   // the corresponding password form, so that it can be saved.
   virtual void ForceSavePassword() {}
 
+  // Tells the driver to show the manual fallback for password saving, i.e. to
+  // show the omnibox icon with anchored hidden save prompt.
+  virtual void ShowManualFallbackForSaving(const autofill::PasswordForm& form) {
+  }
+
+  // Tells the driver to hide the manual fallback for saving.
+  virtual void HideManualFallbackForSaving() {}
+
   // Tells the driver to find the focused password field and to show generation
   // popup at it.
   virtual void GeneratePassword() {}