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

chrome/browser/chromeos/platform_keys/platform_keys_service_factory.h

Index: chrome/browser/chromeos/platform_keys/platform_keys_service_factory.h
diff --git a/chrome/browser/chromeos/platform_keys/platform_keys_service_factory.h b/chrome/browser/chromeos/platform_keys/platform_keys_service_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..d282be0db6fc9cfdde7f15a109f93751ae2658be
--- /dev/null
+++ b/chrome/browser/chromeos/platform_keys/platform_keys_service_factory.h
@@ -0,0 +1,47 @@
+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_PLATFORM_KEYS_PLATFORM_KEYS_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_CHROMEOS_PLATFORM_KEYS_PLATFORM_KEYS_SERVICE_FACTORY_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+class Profile;
+
+namespace chromeos {
+
+class PlatformKeysService;
+
+// Factory to create PlatformKeysService.
+class PlatformKeysServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static PlatformKeysService* GetForBrowserContext(
+      content::BrowserContext* context);
+
+  static PlatformKeysServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<PlatformKeysServiceFactory>;
+
+  PlatformKeysServiceFactory();
+  virtual ~PlatformKeysServiceFactory();
+
+  // BrowserContextKeyedServiceFactory:
+  virtual content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const OVERRIDE;
+  virtual KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(PlatformKeysServiceFactory);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_PLATFORM_KEYS_PLATFORM_KEYS_SERVICE_FACTORY_H_