Add the Sign-At-Most-Once restriction the enterprise.platformKeys API.

chrome/browser/chromeos/platform_keys/platform_keys_service_factory.cc

Index: chrome/browser/chromeos/platform_keys/platform_keys_service_factory.cc
diff --git a/chrome/browser/chromeos/platform_keys/platform_keys_service_factory.cc b/chrome/browser/chromeos/platform_keys/platform_keys_service_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a1098056505785f2d602a3c5a88b59ccb6bc0945
--- /dev/null
+++ b/chrome/browser/chromeos/platform_keys/platform_keys_service_factory.cc
@@ -0,0 +1,51 @@
+// 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 "chrome/browser/chromeos/platform_keys/platform_keys_service_factory.h"
+
+#include "base/logging.h"
+#include "base/memory/singleton.h"
+#include "chrome/browser/chromeos/platform_keys/platform_keys_service.h"
+#include "chrome/browser/extensions/extension_system_factory.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+namespace chromeos {
+
+// static
+PlatformKeysService* PlatformKeysServiceFactory::GetForBrowserContext(
+    content::BrowserContext* context) {
+  return static_cast<PlatformKeysService*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
+}
+
+// static
+PlatformKeysServiceFactory* PlatformKeysServiceFactory::GetInstance() {
+  return Singleton<PlatformKeysServiceFactory>::get();
+}
+
+PlatformKeysServiceFactory::PlatformKeysServiceFactory()
+    : BrowserContextKeyedServiceFactory(
+          "PlatformKeysService",
+          BrowserContextDependencyManager::GetInstance()) {
+  DependsOn(extensions::ExtensionSystemFactory::GetInstance());
+}
+
+PlatformKeysServiceFactory::~PlatformKeysServiceFactory() {
+}
+
+content::BrowserContext* PlatformKeysServiceFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return chrome::GetBrowserContextRedirectedInIncognito(context);
+}
+
+KeyedService* PlatformKeysServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  extensions::StateStore* store =
+      extensions::ExtensionSystem::Get(context)->state_store();
+  DCHECK(store);
+  return new PlatformKeysService(store);
+}
+
+}  // namespace chromeos