[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..886f04fb29e0f2a06a4538abf971a543f04ec1ee 100644
--- a/components/autofill/core/browser/autofill_manager.h
+++ b/components/autofill/core/browser/autofill_manager.h
@@ -94,6 +94,12 @@ class AutofillManager : public AutofillDownloadManager::Observer,
   virtual bool ShouldShowScanCreditCard(const FormData& form,
                                         const FormFieldData& field);
 
+  // Whether we should show the sign in promo, based on the triggered |field|

[Evan Stade, 2016/07/08 17:34:58]

nit: for consistency, this should be "signin" everywhere and not "sign-in" or
"sign in". ("sign in" is the verb form but I don't see any usages of the verb
here)

[Mathieu, 2016/07/08 18:10:02]

Done.

+  // inside the |form|. Will also check whether sign-in is possible for this

[Evan Stade, 2016/07/08 17:34:58]

nit: the last sentence is a bit redundant/confusing imho

[Mathieu, 2016/07/08 18:10:02]

Done.

+  // user.
+  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,