Migrate Extensions code to Task Scheduler API

extensions/browser/api/storage/local_value_store_cache.cc

 // Copyright 2014 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 "extensions/browser/api/storage/local_value_store_cache.h"
 
 #include <stddef.h>
 
 #include <limits>
 
 #include "content/public/browser/browser_thread.h"
+#include "extensions/browser/api/storage/backend_task_runner.h"
 #include "extensions/browser/api/storage/weak_unlimited_settings_storage.h"
 #include "extensions/browser/value_store/value_store_factory.h"
 #include "extensions/common/api/storage.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/permissions/permissions_data.h"
 
 using content::BrowserThread;
 
 namespace extensions {
 
@@ skipping 10 matching lines @@
 
 }  // namespace
 
 LocalValueStoreCache::LocalValueStoreCache(
     const scoped_refptr<ValueStoreFactory>& factory)
     : storage_factory_(factory), quota_(GetLocalQuotaLimits()) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 }
 
 LocalValueStoreCache::~LocalValueStoreCache() {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(IsOnBackendSequence());
 }
 
 void LocalValueStoreCache::RunWithValueStoreForExtension(
     const StorageCallback& callback,
     scoped_refptr<const Extension> extension) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(IsOnBackendSequence());
 
   ValueStore* storage = GetStorage(extension.get());
 
   // A neat way to implement unlimited storage; if the extension has the
   // unlimited storage permission, force through all calls to Set().
   if (extension->permissions_data()->HasAPIPermission(
           APIPermission::kUnlimitedStorage)) {
     WeakUnlimitedSettingsStorage unlimited_storage(storage);
     callback.Run(&unlimited_storage);
   } else {
     callback.Run(storage);
   }
 }
 
 void LocalValueStoreCache::DeleteStorageSoon(const std::string& extension_id) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(IsOnBackendSequence());
   storage_map_.erase(extension_id);
   storage_factory_->DeleteSettings(settings_namespace::LOCAL,
                                    ValueStoreFactory::ModelType::APP,
                                    extension_id);
   storage_factory_->DeleteSettings(settings_namespace::LOCAL,
                                    ValueStoreFactory::ModelType::EXTENSION,
                                    extension_id);
 }
 
 ValueStore* LocalValueStoreCache::GetStorage(const Extension* extension) {
   StorageMap::iterator iter = storage_map_.find(extension->id());
   if (iter != storage_map_.end())
     return iter->second.get();
 
   ValueStoreFactory::ModelType model_type =
       extension->is_app() ? ValueStoreFactory::ModelType::APP
                           : ValueStoreFactory::ModelType::EXTENSION;
   std::unique_ptr<ValueStore> store = storage_factory_->CreateSettingsStore(
       settings_namespace::LOCAL, model_type, extension->id());
   std::unique_ptr<SettingsStorageQuotaEnforcer> storage(
       new SettingsStorageQuotaEnforcer(quota_, std::move(store)));
   DCHECK(storage.get());
 
   ValueStore* storage_ptr = storage.get();
   storage_map_[extension->id()] = std::move(storage);
   return storage_ptr;
 }
 
 }  // namespace extensions