Add a header when fetching pages under the DMServer URL.

chrome/browser/policy/cloud/policy_header_service.h

Index: chrome/browser/policy/cloud/policy_header_service.h
diff --git a/chrome/browser/policy/cloud/policy_header_service.h b/chrome/browser/policy/cloud/policy_header_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..b1e01ea6488d675e36fcd728f0dd1912886722d6
--- /dev/null
+++ b/chrome/browser/policy/cloud/policy_header_service.h
@@ -0,0 +1,69 @@
+// 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_H_
+#define CHROME_BROWSER_POLICY_CLOUD_POLICY_HEADER_SERVICE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/policy/core/common/cloud/cloud_policy_store.h"
+
+namespace base {
+class SequencedTaskRunner;
+}
+
+namespace policy {
+
+class PolicyHeaderIOHelper;
+
+// Per-profile service used to generate PolicyHeaderIOHelper objects, and
+// keep them up-to-date as policy changes.
+// TODO(atwilson): Move to components/policy once CloudPolicyStore is moved.
+class PolicyHeaderService : public CloudPolicyStore::Observer {
+ public:
+  // |device_policy_store| can be null on platforms that do not support
+  // device policy. Both |user_policy_store| and |device_policy_store| must
+  // outlive this object.
+  PolicyHeaderService(const std::string& server_url,
+                      CloudPolicyStore* user_policy_store,
+                      CloudPolicyStore* device_policy_store);
+  virtual ~PolicyHeaderService();
+
+  // Creates a PolicyHeaderIOHelper object to be run on the IO thread and
+  // add policy headers to outgoing requests. The caller takes ownership of
+  // this object and must ensure it outlives ProfileHeaderService (in practice,
+  // this is called by ProfileIOData, which is shutdown *after* all
+  // ProfileKeyedServices are shutdown).
+  scoped_ptr<PolicyHeaderIOHelper> CreatePolicyHeaderIOHelper(
+      scoped_refptr<base::SequencedTaskRunner> task_runner);
+
+  // Overridden CloudPolicyStore::Observer methods:
+  virtual void OnStoreLoaded(CloudPolicyStore* store) OVERRIDE;
+  virtual void OnStoreError(CloudPolicyStore* store) OVERRIDE;
+
+ protected:
+  // Generate a policy header based on the currently loaded policy.
+  // Virtual to allow mocking in tests.
+  virtual std::string CreateHeaderValue();
+
+ private:
+  // Weak pointer to created PolicyHeaderIOHelper objects.
+  std::vector<PolicyHeaderIOHelper*> helpers_;
+
+  // URL of the policy server.
+  std::string server_url_;
+
+  // Weak pointers to User-/Device-level policy stores.
+  CloudPolicyStore* user_policy_store_;
+  CloudPolicyStore* device_policy_store_;
+
+  DISALLOW_COPY_AND_ASSIGN(PolicyHeaderService);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CLOUD_POLICY_HEADER_SERVICE_H_