mac: Only show the access Address Book prompt a fixed number of times.

components/autofill/core/common/autofill_pref_names.cc

 // 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.
 
 #include "components/autofill/core/common/autofill_pref_names.h"
 
 namespace autofill {
 namespace prefs {
 
 // Boolean that is true when auxiliary Autofill profiles are enabled. This pref
 // is only relevant to Android.
 const char kAutofillAuxiliaryProfilesEnabled[] =
     "autofill.auxiliary_profiles_enabled";
 
 // Boolean that is true if Autofill is enabled and allowed to save profile data.
 const char kAutofillEnabled[] = "autofill.enabled";
 
 // Boolean that is true when Chrome has attempted to access the user's Address
 // Book on Mac. This preference is important since the first time Chrome
 // attempts to access the user's Address Book, Cocoa presents a blocking dialog
 // to the user.
 const char kAutofillMacAddressBookQueried[] =
     "autofill.auxiliary_profiles_queried";
 
+// The number of times that the access Address Book prompt has been shown. It
+// will only show for a fixed number of instances, and then it will stop
+// showing.
+const char kAutofillMacAddressBookShowedCount[] =
+    "autofill.mac_address_book_prompt_showed_count";
+
 // Double that indicates negative (for not matched forms) upload rate.
 const char kAutofillNegativeUploadRate[] = "autofill.negative_upload_rate";
 
 // Double that indicates positive (for matched forms) upload rate.
 const char kAutofillPositiveUploadRate[] = "autofill.positive_upload_rate";
 
 // Whether Autofill should try to use the Mac Address Book. If this value is
 // true, then kAutofillMacAddressBookQueried is expected to also be true.
 const char kAutofillUseMacAddressBook[] = "autofill.use_mac_address_book";
 
 }  // namespace prefs
 }  // namespace autofill