Add a header when fetching pages under the DMServer URL.

chrome/browser/policy/cloud/policy_header_service_factory.h

+// Copyright (c) 2013 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_POLICY_CLOUD_POLICY_HEADER_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_POLICY_CLOUD_POLICY_HEADER_SERVICE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+
+namespace policy {
+
+class PolicyHeaderService;
+
+// Factory for PolicyHeaderService objects. PolicyHeaderService is not actually
+// a BrowserContextKeyedService, so this class wraps PolicyHeaderService in
+// a BrowserContextKeyedService internally.
+class PolicyHeaderServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  // Returns the instance of PolicyHeaderService for the passed |context|, or
+  // NULL if there is none (for instance, for incognito windows).
+  static PolicyHeaderService* GetForBrowserContext(
+      content::BrowserContext* context);
+
+  // Returns an instance of the PolicyHeaderServiceFactory singleton.
+  static PolicyHeaderServiceFactory* GetInstance();
+
+ protected:
+  // BrowserContextKeyedServiceFactory implementation.
+  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const OVERRIDE;
+
+ private:
+  friend struct DefaultSingletonTraits<PolicyHeaderServiceFactory>;
+
+  PolicyHeaderServiceFactory();
+  virtual ~PolicyHeaderServiceFactory();
+
+  DISALLOW_COPY_AND_ASSIGN(PolicyHeaderServiceFactory);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CLOUD_POLICY_HEADER_SERVICE_FACTORY_H_