[Autofill] Implement Credit Card Signin Promo

components/autofill/core/browser/autofill_client.h

Index: components/autofill/core/browser/autofill_client.h
diff --git a/components/autofill/core/browser/autofill_client.h b/components/autofill/core/browser/autofill_client.h
index b83d6efb087e4a98f08399a8105c65ae2cd53e83..354610bbcd112bfa29c3e1150feed3c81de259f7 100644
--- a/components/autofill/core/browser/autofill_client.h
+++ b/components/autofill/core/browser/autofill_client.h
@@ -181,6 +181,13 @@ class AutofillClient {
 
   // 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