DCHECK(CalledOnValidThread()) for ScopedUserPrefUpdate

base/prefs/scoped_user_pref_update.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 "base/prefs/scoped_user_pref_update.h"
 
 #include "base/logging.h"
 #include "base/prefs/pref_notifier.h"
 #include "base/prefs/pref_service.h"
 
 namespace subtle {
 
 ScopedUserPrefUpdateBase::ScopedUserPrefUpdateBase(PrefService* service,
                                                    const char* path)
     : service_(service),
       path_(path),
-      value_(NULL) {}
+      value_(NULL) {
+  DCHECK(service_->CalledOnValidThread());
+}
 
 ScopedUserPrefUpdateBase::~ScopedUserPrefUpdateBase() {
   Notify();
 }
 
 base::Value* ScopedUserPrefUpdateBase::GetValueOfType(base::Value::Type type) {
+  DCHECK(CalledOnValidThread());
   if (!value_)
     value_ = service_->GetMutableUserPref(path_.c_str(), type);
   return value_;
 }
 
 void ScopedUserPrefUpdateBase::Notify() {
   if (value_) {
     service_->ReportUserPrefChanged(path_);
     value_ = NULL;
   }
 }
 
 }  // namespace subtle