Upstream Chrome on iOS source code [2/11].

ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios_factory.mm

Index: ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios_factory.mm
diff --git a/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios_factory.mm b/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios_factory.mm
new file mode 100644
index 0000000000000000000000000000000000000000..9bd7cc9f32dd8c9c9f562f029f102e0f7134b471
--- /dev/null
+++ b/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios_factory.mm
@@ -0,0 +1,43 @@
+// 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 "ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios_factory.h"
+
+#include <memory>
+
+#include "base/memory/ptr_util.h"
+#include "base/memory/singleton.h"
+#include "components/keyed_service/ios/browser_state_dependency_manager.h"
+#include "ios/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.h"
+
+// static
+TabRestoreServiceDelegateImplIOS*
+TabRestoreServiceDelegateImplIOSFactory::GetForBrowserState(
+    ios::ChromeBrowserState* browser_state) {
+  return static_cast<TabRestoreServiceDelegateImplIOS*>(
+      GetInstance()->GetServiceForBrowserState(browser_state, true));
+}
+
+// static
+TabRestoreServiceDelegateImplIOSFactory*
+TabRestoreServiceDelegateImplIOSFactory::GetInstance() {
+  return base::Singleton<TabRestoreServiceDelegateImplIOSFactory>::get();
+}
+
+TabRestoreServiceDelegateImplIOSFactory::
+    TabRestoreServiceDelegateImplIOSFactory()
+    : BrowserStateKeyedServiceFactory(
+          "TabRestoreServiceDelegateImplIOS",
+          BrowserStateDependencyManager::GetInstance()) {}
+
+TabRestoreServiceDelegateImplIOSFactory::
+    ~TabRestoreServiceDelegateImplIOSFactory() {}
+
+std::unique_ptr<KeyedService>
+TabRestoreServiceDelegateImplIOSFactory::BuildServiceInstanceFor(
+    web::BrowserState* context) const {
+  return base::MakeUnique<TabRestoreServiceDelegateImplIOS>(
+      ios::ChromeBrowserState::FromBrowserState(context));
+}