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

components/autofill/content/renderer/password_autofill_agent.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/autofill/content/renderer/password_autofill_agent.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 1756 matching lines @@
     password->SetSuggestedValue(blink::WebString());
     password->SetAutofilled(was_password_autofilled_);
   }
 }
 
 void PasswordAutofillAgent::ProvisionallySavePassword(
     std::unique_ptr<PasswordForm> password_form,
     const blink::WebFormElement& form,
     const blink::WebInputElement& input,
     ProvisionallySaveRestriction restriction) {
-  if (!password_form || (restriction == RESTRICTION_NON_EMPTY_PASSWORD &&
-                         password_form->password_value.empty() &&
-                         password_form->new_password_value.empty())) {
+  if (!password_form)
     return;
-  }
+  bool has_no_password = password_form->password_value.empty() &&
+                         password_form->new_password_value.empty();
+  if (restriction == RESTRICTION_NON_EMPTY_PASSWORD && has_no_password)
+    return;
+
   DCHECK(password_form && (!form.IsNull() || !input.IsNull()));
   provisionally_saved_form_.Set(std::move(password_form), form, input);
+  if (!has_no_password) {
+    GetPasswordManagerDriver()->ShowManualFallbackForSaving(
+        provisionally_saved_form_.password_form());
+  } else {
+    GetPasswordManagerDriver()->HideManualFallbackForSaving();
+  }
 }
 
 const mojom::AutofillDriverPtr& PasswordAutofillAgent::GetAutofillDriver() {
   DCHECK(autofill_agent_);
   return autofill_agent_->GetAutofillDriver();
 }
 
 const mojom::PasswordManagerDriverPtr&
 PasswordAutofillAgent::GetPasswordManagerDriver() {
   if (!password_manager_driver_) {
     render_frame()->GetRemoteInterfaces()->GetInterface(
         mojo::MakeRequest(&password_manager_driver_));
   }
 
   return password_manager_driver_;
 }
 
 }  // namespace autofill