[Password Manager] Use successful XHR submission as a signal for password saving

components/autofill/content/renderer/autofill_agent.h

 // 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.
 
 #ifndef COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 128 matching lines @@
       const blink::WebInputElement& element,
       const blink::WebKeyboardEvent& event);
   virtual void didRequestAutocomplete(
       const blink::WebFormElement& form);
   virtual void setIgnoreTextChanges(bool ignore);
   virtual void didAssociateFormControls(
       const blink::WebVector<blink::WebNode>& nodes);
   virtual void openTextDataListChooser(const blink::WebInputElement& element);
   virtual void dataListOptionsChanged(const blink::WebInputElement& element);
   virtual void firstUserGestureObserved();
+  virtual void xhrSucceeded();
 
   void OnFieldTypePredictionsAvailable(
       const std::vector<FormDataPredictions>& forms);
   void OnFillForm(int query_id, const FormData& form);
   void OnFirstUserGestureObservedInTab();
   void OnPing();
   void OnPreviewForm(int query_id, const FormData& form);
 
   // For external Autofill selection.
   void OnClearForm();
@@ skipping 115 matching lines @@
   bool is_popup_possibly_visible_;
 
   base::WeakPtrFactory<AutofillAgent> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillAgent);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_