Implement DBus changes needed for notifications.

device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.h

Index: device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.h
diff --git a/device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.h b/device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.h
index f44847aab58d2d415546bc5629c10f6635a94b49..69898e63e222bec360e2bde4d2d2fc50dee35d77 100644
--- a/device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.h
+++ b/device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.h
@@ -44,6 +44,16 @@ class BluetoothGattAttributeValueDelegate {
       const base::Closure& callback,
       const device::BluetoothLocalGattService::Delegate::ErrorCallback&
           error_callback) = 0;
+
+  // This method will be called, when a remote device requests to start sending
+  // notifications for this characteristic. This will never be called for
+  // descriptors.
+  virtual void StartNotifications() = 0;
+
+  // This method will be called, when a remote device requests to stop sending
+  // notifications for this characteristic. This will never be called for
+  // descriptors.
+  virtual void StopNotifications() = 0;
 };
 
 }  // namespace bluez