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

components/password_manager/core/browser/password_manager.cc

Index: components/password_manager/core/browser/password_manager.cc
diff --git a/components/password_manager/core/browser/password_manager.cc b/components/password_manager/core/browser/password_manager.cc
index 3546bfe79bfb3e55ab159168001b38cc0d95608c..c406e009e616d3a144f36a12258fd08214472434 100644
--- a/components/password_manager/core/browser/password_manager.cc
+++ b/components/password_manager/core/browser/password_manager.cc
@@ -137,6 +137,16 @@ bool AreAllFieldsEmpty(const PasswordForm& form) {
          form.new_password_value.empty();
 }
 
+// Helper function that determines whether update or save prompt should be
+// shown for credentials in |provisional_save_manager|.
+bool IsPasswordUpdate(const PasswordFormManager& provisional_save_manager) {
+  return (!provisional_save_manager.best_matches().empty() &&
+          provisional_save_manager
+              .is_possible_change_password_form_without_username()) ||
+         provisional_save_manager.password_overridden() ||
+         provisional_save_manager.retry_password_form_password_update();
+}
+
 }  // namespace
 
 // static
@@ -470,6 +480,27 @@ void PasswordManager::OnPasswordFormForceSaveRequested(
     OnLoginSuccessful();
 }
 
+void PasswordManager::ShowManualFallbackForSaving(
+    password_manager::PasswordManagerDriver* driver,
+    const PasswordForm& password_form) {
+  ProvisionallySavePassword(password_form, driver);
+  DCHECK(provisional_save_manager_);
+  DCHECK(provisional_save_manager_->form_fetcher());
+  // TODO(crbug.com/741537): Process manual saving request even if there is
+  // still no response from the store.
+  if (provisional_save_manager_->form_fetcher()->GetState() ==
+      FormFetcher::State::WAITING) {
+    return;
+  }
+  bool is_update = IsPasswordUpdate(*provisional_save_manager_);
+  client_->ShowManualFallbackForSaving(std::move(provisional_save_manager_),
+                                       is_update);
+}
+
+void PasswordManager::HideManualFallbackForSaving() {
+  client_->HideManualFallbackForSaving();
+}
+
 void PasswordManager::OnPasswordFormsParsed(
     password_manager::PasswordManagerDriver* driver,
     const std::vector<PasswordForm>& forms) {
@@ -753,12 +784,7 @@ void PasswordManager::OnLoginSuccessful() {
                           empty_password);
     if (logger)
       logger->LogMessage(Logger::STRING_DECISION_ASK);
-    bool update_password =
-        (!provisional_save_manager_->best_matches().empty() &&
-         provisional_save_manager_
-             ->is_possible_change_password_form_without_username()) ||
-        provisional_save_manager_->password_overridden() ||
-        provisional_save_manager_->retry_password_form_password_update();
+    bool update_password = IsPasswordUpdate(*provisional_save_manager_);
     if (client_->PromptUserToSaveOrUpdatePassword(
             std::move(provisional_save_manager_), update_password)) {
       if (logger)