Add initial device policy infrastructure.

chrome/browser/policy/cloud_policy_controller.h

Index: chrome/browser/policy/cloud_policy_controller.h
diff --git a/chrome/browser/policy/cloud_policy_controller.h b/chrome/browser/policy/cloud_policy_controller.h
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+// Copyright (c) 2011 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_CONTROLLER_H_
+#define CHROME_BROWSER_POLICY_CLOUD_POLICY_CONTROLLER_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/observer_list.h"
+
+namespace policy {
+
+// Manages a device management token, i.e. an identifier that represents a
+// registration with the device management service.
+class CloudPolicyController {
+ public:
+  class Observer {
+   public:
+    virtual ~Observer() {}
+
+    // Notifies observers that the effective token for fetching policy has
+    // changed. The token can be queried by calling GetDeviceToken().
+    virtual void OnTokenChanged() = 0;
+
+    // Authentication credentials for talking to the device management service
+    // changed. New auth data is available through GetCredentials().
+    virtual void OnCredentialsChanged() = 0;
+  };
+
+  CloudPolicyController() {}
+  virtual ~CloudPolicyController() {}
+
+  void AddObserver(Observer* obs) {
+    observer_list_.AddObserver(obs);
+  }
+
+  void RemoveObserver(Observer* obs) {
+    observer_list_.RemoveObserver(obs);
+  }
+
+  // Returns the device management token, if available. Returns the empty string
+  // if the device token is currently unavailable.
+  virtual std::string GetDeviceToken() = 0;
+
+  // Returns the device ID for this device.
+  virtual std::string GetDeviceID() = 0;
+
+  // Retrieves authentication credentials to use when talking to the device
+  // management service. Returns true if the data is available and writes the
+  // values to the provided pointers.
+  virtual bool GetCredentials(std::string* username,
+                              std::string* auth_token) = 0;
+
+  // Notifies the provider that a new token has been fetched. It is up to the
+  // provider to decide that token is going to be used, in which case it should
+  // send a OnTokenChanged() notification an return the new token in
+  // GetDeviceToken() calls.
+  virtual void OnTokenAvailable(const std::string& token) = 0;
+
+ protected:
+  // Notify observers that the effective token has changed.
+  void NotifyTokenChanged() {
+    FOR_EACH_OBSERVER(Observer, observer_list_, OnTokenChanged());
+  }
+
+  // Notify observers about authentication data change.
+  void NotifyAuthChanged() {
+    FOR_EACH_OBSERVER(Observer, observer_list_, OnCredentialsChanged());
+  }
+
+ private:
+  ObserverList<Observer, true> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(CloudPolicyController);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CLOUD_POLICY_CONTROLLER_H_