Add Device Policy Handler for Bluetooth, and allow disabling the Bluetooth adapter on Chrome OS

chrome/browser/chromeos/policy/bluetooth_policy_handler.h

+// Copyright (c) 2016 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_POLICY_BLUETOOTH_POLICY_HANDLER_H_
+#define CHROME_BROWSER_CHROMEOS_POLICY_BLUETOOTH_POLICY_HANDLER_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/chromeos/settings/cros_settings.h"
+
+namespace policy {
+
+// This class observes the device setting |DeviceAllowBluetooth|, and calls
+// BluetoothAdapter::SetDisabled() appropriately based on the value of that
+// setting.
+class BluetoothPolicyHandler {
+ public:
+  explicit BluetoothPolicyHandler(chromeos::CrosSettings* cros_settings);
+  ~BluetoothPolicyHandler();
+
+ private:
+  // Once a trusted set of policies is established, this function calls
+  // |SetDisabled| with the trusted state of the |DeviceAllowBluetooth| policy
+  // through helper function |SetBluetoothPolicy|.
+  void OnBluetoothPolicyChanged();
+
+  chromeos::CrosSettings* cros_settings_;
+  std::unique_ptr<chromeos::CrosSettings::ObserverSubscription>
+      bluetooth_policy_subscription_;
+  base::WeakPtrFactory<BluetoothPolicyHandler> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothPolicyHandler);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_CHROMEOS_POLICY_BLUETOOTH_POLICY_HANDLER_H_