[Autofill] Add metrics to determine whether the system AddressBook is accessible.

components/autofill/core/browser/autofill_manager.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/browser/autofill_manager.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <map>
@@ skipping 188 matching lines @@
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterBooleanPref(
       prefs::kAutofillEnabled,
       true,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
   registry->RegisterBooleanPref(
       prefs::kAutofillAuxiliaryProfilesEnabled,
       true,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
-#else
+#else  // defined(OS_MACOSX) || defined(OS_ANDROID)
   registry->RegisterBooleanPref(
       prefs::kAutofillAuxiliaryProfilesEnabled,
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
-#endif
+#endif  // defined(OS_MACOSX) || defined(OS_ANDROID)
+#if defined(OS_MACOSX)
+  registry->RegisterBooleanPref(
+      prefs::kAutofillAuxiliaryProfilesQueried,
+      false,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+#endif  // defined(OS_MACOSX)
   registry->RegisterDoublePref(
       prefs::kAutofillPositiveUploadRate,
       kAutofillPositiveUploadRateDefaultValue,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterDoublePref(
       prefs::kAutofillNegativeUploadRate,
       kAutofillNegativeUploadRateDefaultValue,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
@@ skipping 934 matching lines @@
     return false;
 
   // Disregard forms that we wouldn't ever autofill in the first place.
   if (!form.ShouldBeParsed(true))
     return false;
 
   return true;
 }
 
 }  // namespace autofill