[Autofill] Implement Credit Card Signin Promo

components/autofill/core/browser/autofill_manager.h

Index: components/autofill/core/browser/autofill_manager.h
diff --git a/components/autofill/core/browser/autofill_manager.h b/components/autofill/core/browser/autofill_manager.h
index 2a37e9af4eee86ef13430256b0ea3c4d13e96279..4b906a5a8f65aea79ea8c5802c8e643a147b3304 100644
--- a/components/autofill/core/browser/autofill_manager.h
+++ b/components/autofill/core/browser/autofill_manager.h
@@ -94,6 +94,11 @@ class AutofillManager : public AutofillDownloadManager::Observer,
   virtual bool ShouldShowScanCreditCard(const FormData& form,
                                         const FormFieldData& field);
 
+  // Whether we should show the signin promo, based on the triggered |field|
+  // inside the |form|.
+  virtual bool ShouldShowCreditCardSigninPromo(const FormData& form,
+                                               const FormFieldData& field);
+
   // Called from our external delegate so they cannot be private.
   virtual void FillOrPreviewForm(AutofillDriver::RendererFormDataAction action,
                                  int query_id,