[Sync] Add support for automatic enabling of syncing tab favicons.

chrome/browser/sync/glue/sync_backend_host.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 "build/build_config.h"
 
 #include "chrome/browser/sync/glue/sync_backend_host.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 27 matching lines @@
 #include "jingle/notifier/base/notification_method.h"
 #include "jingle/notifier/base/notifier_options.h"
 #include "net/base/host_port_pair.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "sync/engine/model_safe_worker.h"
 #include "sync/internal_api/base_transaction.h"
 #include "sync/internal_api/read_transaction.h"
 #include "sync/notifier/sync_notifier.h"
 #include "sync/protocol/encryption.pb.h"
 #include "sync/protocol/sync.pb.h"
+#include "sync/util/experiments.h"
 #include "sync/util/nigori.h"
 
 static const int kSaveChangesIntervalSeconds = 10;
 static const FilePath::CharType kSyncDataFolderName[] =
     FILE_PATH_LITERAL("Sync Data");
 
 typedef TokenService::TokenAvailableDetails TokenAvailableDetails;
 
 typedef GoogleServiceAuthError AuthError;
 
@@ skipping 1147 matching lines @@
       this, &Core::SaveChanges);
 }
 
 void SyncBackendHost::Core::SaveChanges() {
   DCHECK_EQ(MessageLoop::current(), sync_loop_);
   sync_manager_->SaveChanges();
 }
 
 void SyncBackendHost::AddExperimentalTypes() {
   CHECK(initialized());
-  syncable::ModelTypeSet to_add;
-  if (core_->sync_manager()->ReceivedExperimentalTypes(&to_add))
-    frontend_->OnDataTypesChanged(to_add);
+  Experiments experiments;
+  if (core_->sync_manager()->ReceivedExperiment(&experiments))
+    frontend_->OnExperimentsChanged(experiments);
 }
 
 void SyncBackendHost::OnNigoriDownloadRetry() {
   DCHECK_EQ(MessageLoop::current(), frontend_loop_);
   if (!frontend_)
     return;
 
   frontend_->OnSyncConfigureRetry();
 }
 
@@ skipping 196 matching lines @@
       FROM_HERE,
       base::Bind(&SyncBackendHost::Core::DoRefreshNigori,
                  core_.get(), sync_thread_done_callback));
 }
 
 #undef SDVLOG
 
 #undef SLOG
 
 }  // namespace browser_sync