Extension syncing: Introduce a NeedsSync pref

chrome/browser/extensions/extension_sync_data.cc

 // Copyright (c) 2012 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/extensions/extension_sync_data.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 184 matching lines @@
   // Only sync the ordinal values and launch type if they are valid.
   if (app_launch_ordinal_.IsValid())
     specifics->set_app_launch_ordinal(app_launch_ordinal_.ToInternalValue());
   if (page_ordinal_.IsValid())
     specifics->set_page_ordinal(page_ordinal_.ToInternalValue());
 
   sync_pb::AppSpecifics::LaunchType sync_launch_type =
       static_cast<sync_pb::AppSpecifics::LaunchType>(launch_type_);
 
   // The corresponding validation of this value during processing of an
-  // AppSyncData is in ExtensionSyncService::ProcessAppSyncData.
+  // ExtensionSyncData is in ExtensionSyncService::ApplySyncData.
   if (launch_type_ >= LAUNCH_TYPE_FIRST && launch_type_ < NUM_LAUNCH_TYPES &&
       sync_pb::AppSpecifics_LaunchType_IsValid(sync_launch_type)) {
     specifics->set_launch_type(sync_launch_type);
   }
 
   if (!bookmark_app_url_.empty())
     specifics->set_bookmark_app_url(bookmark_app_url_);
 
   if (!bookmark_app_description_.empty())
     specifics->set_bookmark_app_description(bookmark_app_description_);
@@ skipping 114 matching lines @@
 
   if (entity_specifics.has_extension())
     return PopulateFromExtensionSpecifics(entity_specifics.extension());
 
   LOG(ERROR) << "Attempt to sync bad EntitySpecifics: no extension data.";
   RecordBadSyncData(NO_EXTENSION_SPECIFICS);
   return false;
 }
 
 }  // namespace extensions