[Autofill] Implement Credit Card Signin Promo

components/autofill/core/browser/autofill_client.h

 // Copyright 2014 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_CORE_BROWSER_AUTOFILL_CLIENT_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_CLIENT_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 163 matching lines @@
   // Inform the client that the field has been filled.
   virtual void DidFillOrPreviewField(
       const base::string16& autofilled_value,
       const base::string16& profile_full_name) = 0;
 
   // Informs the client that a user gesture has been observed.
   virtual void OnFirstUserGestureObserved() = 0;
 
   // If the context is secure.
   virtual bool IsContextSecure(const GURL& form_origin) = 0;
+
+  // Whether it is appropriate to show a signin promo for this user.
+  virtual bool ShouldShowSigninPromo() = 0;
+
+  // Starts the signin flow. Should not be called if ShouldShowSigninPromo()
+  // returns false.
+  virtual void StartSigninFlow() = 0;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_CLIENT_H_