Implement an initial extension settings API.

chrome/browser/extensions/extension_settings_noop_storage.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/extensions/extension_settings_noop_storage.h"
+
+#include "base/bind.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "base/task.h"
+
+static void CallOnSuccess(
+    ExtensionSettingsStorage::Callback* callback, DictionaryValue* settings) {
+  callback->OnSuccess(settings);
+  delete callback;
+}
+
+static void Succeed(
+    ExtensionSettingsStorage::Callback* callback, DictionaryValue* settings) {
+  MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&CallOnSuccess, callback, settings));
+}
+
+void ExtensionSettingsNoopStorage::Get(
+    const std::string& key, ExtensionSettingsStorage::Callback* callback) {
+  Succeed(callback, new DictionaryValue());
+}
+
+void ExtensionSettingsNoopStorage::Get(
+    const ListValue& keys, ExtensionSettingsStorage::Callback* callback) {
+  Succeed(callback, new DictionaryValue());
+}
+
+void ExtensionSettingsNoopStorage::Get(
+    ExtensionSettingsStorage::Callback* callback) {
+  Succeed(callback, new DictionaryValue());
+}
+
+void ExtensionSettingsNoopStorage::Set(
+    const std::string& key,
+    const Value& value,
+    ExtensionSettingsStorage::Callback* callback) {
+  DictionaryValue* settings = new DictionaryValue();
+  settings->Set(key, value.DeepCopy());
+  Succeed(callback, settings);
+}
+
+void ExtensionSettingsNoopStorage::Set(
+    const DictionaryValue& values,
+    ExtensionSettingsStorage::Callback* callback) {
+  Succeed(callback, values.DeepCopy());
+}
+
+void ExtensionSettingsNoopStorage::Remove(
+    const std::string& key, ExtensionSettingsStorage::Callback *callback) {
+  Succeed(callback, new DictionaryValue());
+}
+
+void ExtensionSettingsNoopStorage::Remove(
+    const ListValue& keys, ExtensionSettingsStorage::Callback *callback) {
+  Succeed(callback, new DictionaryValue());
+}
+
+void ExtensionSettingsNoopStorage::Clear(
+    ExtensionSettingsStorage::Callback* callback) {
+  Succeed(callback, new DictionaryValue());
+}