Add support for temporarily disabling sync.

chrome/browser/sync/sync_prefs.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/sync_prefs.h"
 
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
 #include "build/build_config.h"
@@ skipping 68 matching lines @@
       pref_service_->GetBoolean(prefs::kSyncSuppressStart);
 }
 
 void SyncPrefs::SetStartSuppressed(bool is_suppressed) {
   DCHECK(non_thread_safe_.CalledOnValidThread());
   CHECK(pref_service_);
   pref_service_->SetBoolean(prefs::kSyncSuppressStart, is_suppressed);
   pref_service_->ScheduleSavePersistentPrefs();
 }
 
+std::string SyncPrefs::GetGoogleServicesUsername() const {
+  DCHECK(non_thread_safe_.CalledOnValidThread());
+  return
+      pref_service_ ?
+      pref_service_->GetString(prefs::kGoogleServicesUsername) : "";
+}
+
 base::Time SyncPrefs::GetLastSyncedTime() const {
   DCHECK(non_thread_safe_.CalledOnValidThread());
   return
       base::Time::FromInternalValue(
           pref_service_ ?
           pref_service_->GetInt64(prefs::kSyncLastSyncedTime) : 0);
 }
 
 void SyncPrefs::SetLastSyncedTime(base::Time time) {
   DCHECK(non_thread_safe_.CalledOnValidThread());
@@ skipping 375 matching lines @@
   const char* pref_name = GetPrefNameForDataType(type);
   if (!pref_name) {
     NOTREACHED();
     return;
   }
   pref_service_->SetBoolean(pref_name, is_preferred);
   pref_service_->ScheduleSavePersistentPrefs();
 }
 
 }  // namespace browser_sync