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diff --git a/chromium/device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.h b/chromium/device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.h
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+++ b/chromium/device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.h
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+// 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 DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_CHROMEOS_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_CHROMEOS_H_
+
+#include <map>
+#include <queue>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/memory/weak_ptr.h"
+#include "chromeos/dbus/bluetooth_gatt_characteristic_client.h"
+#include "chromeos/dbus/bluetooth_gatt_descriptor_client.h"
+#include "dbus/object_path.h"
+#include "device/bluetooth/bluetooth_gatt_characteristic.h"
+#include "device/bluetooth/bluetooth_uuid.h"
+
+namespace device {
+
+class BluetoothGattDescriptor;
+class BluetoothGattService;
+
+}  // namespace device
+
+namespace chromeos {
+
+class BluetoothRemoteGattDescriptorChromeOS;
+class BluetoothRemoteGattServiceChromeOS;
+
+// The BluetoothRemoteGattCharacteristicChromeOS class implements
+// BluetoothGattCharacteristic for remote GATT characteristics on the Chrome OS
+// platform.
+class BluetoothRemoteGattCharacteristicChromeOS
+    : public device::BluetoothGattCharacteristic,
+      public BluetoothGattCharacteristicClient::Observer,
+      public BluetoothGattDescriptorClient::Observer {
+ public:
+  // device::BluetoothGattCharacteristic overrides.
+  virtual std::string GetIdentifier() const OVERRIDE;
+  virtual device::BluetoothUUID GetUUID() const OVERRIDE;
+  virtual bool IsLocal() const OVERRIDE;
+  virtual const std::vector<uint8>& GetValue() const OVERRIDE;
+  virtual device::BluetoothGattService* GetService() const OVERRIDE;
+  virtual Properties GetProperties() const OVERRIDE;
+  virtual Permissions GetPermissions() const OVERRIDE;
+  virtual bool IsNotifying() const OVERRIDE;
+  virtual std::vector<device::BluetoothGattDescriptor*>
+      GetDescriptors() const OVERRIDE;
+  virtual device::BluetoothGattDescriptor* GetDescriptor(
+      const std::string& identifier) const OVERRIDE;
+  virtual bool AddDescriptor(
+      device::BluetoothGattDescriptor* descriptor) OVERRIDE;
+  virtual bool UpdateValue(const std::vector<uint8>& value) OVERRIDE;
+  virtual void ReadRemoteCharacteristic(
+      const ValueCallback& callback,
+      const ErrorCallback& error_callback) OVERRIDE;
+  virtual void WriteRemoteCharacteristic(
+      const std::vector<uint8>& new_value,
+      const base::Closure& callback,
+      const ErrorCallback& error_callback) OVERRIDE;
+  virtual void StartNotifySession(const NotifySessionCallback& callback,
+                                  const ErrorCallback& error_callback) OVERRIDE;
+
+  // Removes one value update session and invokes |callback| on completion. This
+  // decrements the session reference count by 1 and if the number reaches 0,
+  // makes a call to the subsystem to stop notifications from this
+  // characteristic.
+  void RemoveNotifySession(const base::Closure& callback);
+
+  // Object path of the underlying D-Bus characteristic.
+  const dbus::ObjectPath& object_path() const { return object_path_; }
+
+ private:
+  friend class BluetoothRemoteGattServiceChromeOS;
+
+  BluetoothRemoteGattCharacteristicChromeOS(
+      BluetoothRemoteGattServiceChromeOS* service,
+      const dbus::ObjectPath& object_path);
+  virtual ~BluetoothRemoteGattCharacteristicChromeOS();
+
+  // BluetoothGattCharacteristicClient::Observer overrides.
+  virtual void GattCharacteristicValueUpdated(
+      const dbus::ObjectPath& object_path,
+      const std::vector<uint8>& value) OVERRIDE;
+
+  // BluetoothGattDescriptorClient::Observer overrides.
+  virtual void GattDescriptorAdded(
+      const dbus::ObjectPath& object_path) OVERRIDE;
+  virtual void GattDescriptorRemoved(
+      const dbus::ObjectPath& object_path) OVERRIDE;
+
+  // Called by dbus:: on successful completion of a request to read
+  // the characteristic value.
+  void OnValueSuccess(const ValueCallback& callback,
+                      const std::vector<uint8>& value);
+
+  // Called by dbus:: on unsuccessful completion of a request to read or write
+  // the characteristic value.
+  void OnError(const ErrorCallback& error_callback,
+               const std::string& error_name,
+               const std::string& error_message);
+
+  // Called by dbus:: on successful completion of a request to start
+  // notifications.
+  void OnStartNotifySuccess(const NotifySessionCallback& callback);
+
+  // Called by dbus:: on unsuccessful completion of a request to start
+  // notifications.
+  void OnStartNotifyError(const ErrorCallback& error_callback,
+                          const std::string& error_name,
+                          const std::string& error_message);
+
+  // Called by dbus:: on successful completion of a request to stop
+  // notifications.
+  void OnStopNotifySuccess(const base::Closure& callback);
+
+  // Called by dbus:: on unsuccessful completion of a request to stop
+  // notifications.
+  void OnStopNotifyError(const base::Closure& callback,
+                         const std::string& error_name,
+                         const std::string& error_message);
+
+  // Calls StartNotifySession for each queued request.
+  void ProcessStartNotifyQueue();
+
+  // Object path of the D-Bus characteristic object.
+  dbus::ObjectPath object_path_;
+
+  // The GATT service this GATT characteristic belongs to.
+  BluetoothRemoteGattServiceChromeOS* service_;
+
+  // The cached characteristic value based on the most recent read or
+  // notification.
+  std::vector<uint8> cached_value_;
+
+  // The total number of currently active value update sessions.
+  size_t num_notify_sessions_;
+
+  // Calls to StartNotifySession that are pending. This can happen during the
+  // first remote call to start notifications.
+  typedef std::pair<NotifySessionCallback, ErrorCallback>
+      PendingStartNotifyCall;
+  std::queue<PendingStartNotifyCall> pending_start_notify_calls_;
+
+  // True, if a Start or Stop notify call to bluetoothd is currently pending.
+  bool notify_call_pending_;
+
+  // Mapping from GATT descriptor object paths to descriptor objects owned by
+  // this characteristic. Since the Chrome OS implementation uses object paths
+  // as unique identifiers, we also use this mapping to return descriptors by
+  // identifier.
+  typedef std::map<dbus::ObjectPath, BluetoothRemoteGattDescriptorChromeOS*>
+      DescriptorMap;
+  DescriptorMap descriptors_;
+
+  // Note: This should remain the last member so it'll be destroyed and
+  // invalidate its weak pointers before any other members are destroyed.
+  base::WeakPtrFactory<BluetoothRemoteGattCharacteristicChromeOS>
+      weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothRemoteGattCharacteristicChromeOS);
+};
+
+}  // namespace chromeos
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_CHROMEOS_H_