Implement //device/bt changes for notifications.

device/bluetooth/bluez/bluetooth_adapter_bluez.h

Index: device/bluetooth/bluez/bluetooth_adapter_bluez.h
diff --git a/device/bluetooth/bluez/bluetooth_adapter_bluez.h b/device/bluetooth/bluez/bluetooth_adapter_bluez.h
index 63a5b147fa8aa7985a722ff64e8153801658d38a..91b88633bb511dece6566f035499d360a0430f73 100644
--- a/device/bluetooth/bluez/bluetooth_adapter_bluez.h
+++ b/device/bluetooth/bluez/bluetooth_adapter_bluez.h
@@ -45,6 +45,7 @@ namespace bluez {
 class BluetoothBlueZTest;
 class BluetoothAdapterProfileBlueZ;
 class BluetoothDeviceBlueZ;
+class BluetoothLocalGattCharacteristicBlueZ;
 class BluetoothLocalGattServiceBlueZ;
 class BluetoothGattApplicationServiceProvider;
 class BluetoothPairingBlueZ;
@@ -178,6 +179,12 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapterBlueZ
   // Returns if a given service is currently registered.
   bool IsGattServiceRegistered(BluetoothLocalGattServiceBlueZ* service);
 
+  // Send a notification for this characteristic that its value has been
+  // updated. If the service that owns that characteristic is not registered,
+  // this method will return false.
+  bool SendValueChanged(BluetoothLocalGattCharacteristicBlueZ* characteristic,
+                        const std::vector<uint8_t>& value);
+
   // Returns the object path of the adapter.
   dbus::ObjectPath GetApplicationObjectPath() const;