Enable sync for the settings from the Extension Settings API.

chrome/browser/extensions/extension_settings_ui_wrapper.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_ui_wrapper.h"
+
+#include "base/bind.h"
+#include "base/file_path.h"
+#include "chrome/browser/extensions/extension_settings.h"
+#include "content/browser/browser_thread.h"
+
+ExtensionSettingsUIWrapper::ExtensionSettingsUIWrapper(
+    const FilePath& base_path)
+    : core_(new ExtensionSettingsUIWrapper::Core()) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  BrowserThread::PostTask(
+      BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(
+          &ExtensionSettingsUIWrapper::Core::InitOnFileThread,
+          core_.get(),
+          base_path));
+}
+
+void ExtensionSettingsUIWrapper::RunWithSettings(
+    const SettingsCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  BrowserThread::PostTask(
+      BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(
+          &ExtensionSettingsUIWrapper::Core::RunWithSettingsOnFileThread,
+          core_.get(),
+          callback));
+}
+
+ExtensionSettingsUIWrapper::~ExtensionSettingsUIWrapper() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+}
+
+ExtensionSettingsUIWrapper::Core::Core()
+    : extension_settings_(NULL) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+}
+
+void ExtensionSettingsUIWrapper::Core::InitOnFileThread(
+    const FilePath& base_path) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  DCHECK(!extension_settings_);
+  extension_settings_ = new ExtensionSettings(base_path);
+}
+
+void ExtensionSettingsUIWrapper::Core::RunWithSettingsOnFileThread(
+    const SettingsCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  DCHECK(extension_settings_);
+  callback.Run(extension_settings_);
+}
+
+ExtensionSettingsUIWrapper::Core::~Core() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI) ||
+      BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  BrowserThread::DeleteSoon(
+      BrowserThread::FILE, FROM_HERE, extension_settings_);
+}