Enable sync for the settings from the Extension Settings API.

chrome/browser/sync/profile_sync_service.cc

 // Copyright (c) 2011 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 "chrome/browser/sync/profile_sync_service.h"
 
 #include <stddef.h>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 297 matching lines @@
                                     PrefService::UNSYNCABLE_PREF);
   pref_service->RegisterBooleanPref(prefs::kSyncAutofill,
                                     enable_by_default,
                                     PrefService::UNSYNCABLE_PREF);
   pref_service->RegisterBooleanPref(prefs::kSyncThemes,
                                     enable_by_default,
                                     PrefService::UNSYNCABLE_PREF);
   pref_service->RegisterBooleanPref(prefs::kSyncTypedUrls,
                                     enable_by_default,
                                     PrefService::UNSYNCABLE_PREF);
+  pref_service->RegisterBooleanPref(prefs::kSyncExtensionSettings,
+                                    enable_by_default,
+                                    PrefService::UNSYNCABLE_PREF);
   pref_service->RegisterBooleanPref(prefs::kSyncExtensions,
                                     enable_by_default,
                                     PrefService::UNSYNCABLE_PREF);
   pref_service->RegisterBooleanPref(prefs::kSyncApps,
                                     enable_by_default,
                                     PrefService::UNSYNCABLE_PREF);
   pref_service->RegisterBooleanPref(prefs::kSyncSearchEngines,
                                     enable_by_default,
                                     PrefService::UNSYNCABLE_PREF);
   pref_service->RegisterBooleanPref(prefs::kSyncSessions,
@@ skipping 221 matching lines @@
     case syncable::PREFERENCES:
       return prefs::kSyncPreferences;
     case syncable::AUTOFILL:
       return prefs::kSyncAutofill;
     case syncable::AUTOFILL_PROFILE:
       return prefs::kSyncAutofillProfile;
     case syncable::THEMES:
       return prefs::kSyncThemes;
     case syncable::TYPED_URLS:
       return prefs::kSyncTypedUrls;
+    case syncable::EXTENSION_SETTINGS:
+      return prefs::kSyncExtensionSettings;
     case syncable::EXTENSIONS:
       return prefs::kSyncExtensions;
     case syncable::APPS:
       return prefs::kSyncApps;
     case syncable::SEARCH_ENGINES:
       return prefs::kSyncSearchEngines;
     case syncable::SESSIONS:
       return prefs::kSyncSessions;
     default:
       break;
@@ skipping 1044 matching lines @@
         syncable::ModelTypeBitSetFromValue(
             *profile_->GetPrefs()->GetList(prefs::kAcknowledgedSyncTypes));
     syncable::ModelTypeSet registered;
     GetRegisteredDataTypes(&registered);
     syncable::ModelTypeBitSet registered_bit_set =
         syncable::ModelTypeBitSetFromSet(registered);
     unacknowledged = registered_bit_set & ~acknowledged;
   }
   return unacknowledged;
 }