device/bluetooth: Update characteristic value D-Bus bindings.

chromeos/dbus/fake_bluetooth_gatt_characteristic_client.h

Index: chromeos/dbus/fake_bluetooth_gatt_characteristic_client.h
diff --git a/chromeos/dbus/fake_bluetooth_gatt_characteristic_client.h b/chromeos/dbus/fake_bluetooth_gatt_characteristic_client.h
index 1ae77cbb701adf0dab8b5e4d0b456bfea35ddcf5..2f23586dc33f8bdc90013f36132b222b4afc74bb 100644
--- a/chromeos/dbus/fake_bluetooth_gatt_characteristic_client.h
+++ b/chromeos/dbus/fake_bluetooth_gatt_characteristic_client.h
@@ -49,6 +49,13 @@ class CHROMEOS_EXPORT FakeBluetoothGattCharacteristicClient
   virtual std::vector<dbus::ObjectPath> GetCharacteristics() OVERRIDE;
   virtual Properties* GetProperties(const dbus::ObjectPath& object_path)
       OVERRIDE;
+  virtual void ReadValue(const dbus::ObjectPath& object_path,
+                         const ValueCallback& callback,
+                         const ErrorCallback& error_callback) OVERRIDE;
+  virtual void WriteValue(const dbus::ObjectPath& object_path,
+                          const std::vector<uint8>& value,
+                          const base::Closure& callback,
+                          const ErrorCallback& error_callback) OVERRIDE;
 
   // Makes the group of characteristics belonging to a particular GATT based
   // profile available under the GATT service with object path |service_path|.