Implement //device/bt changes for notifications.

device/bluetooth/test/bluetooth_test.cc

Index: device/bluetooth/test/bluetooth_test.cc
diff --git a/device/bluetooth/test/bluetooth_test.cc b/device/bluetooth/test/bluetooth_test.cc
index 37c2a31084eb43ddf10b3f66c2415dbd6bbfa64f..da4624aff229a5d5649afb165379661de3137772 100644
--- a/device/bluetooth/test/bluetooth_test.cc
+++ b/device/bluetooth/test/bluetooth_test.cc
@@ -68,6 +68,20 @@ BluetoothDevice* BluetoothTestBase::DiscoverLowEnergyDevice(
   return nullptr;
 }
 
+bool BluetoothTestBase::SimulateLocalGattCharacteristicNotificationsRequest(
+    BluetoothLocalGattService* service,
+    BluetoothLocalGattCharacteristic* characteristic,
+    bool start) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
+std::vector<uint8_t> BluetoothTestBase::LastNotifactionValueForCharacteristic(
+    BluetoothLocalGattCharacteristic* characteristic) {
+  NOTIMPLEMENTED();
+  return std::vector<uint8_t>();
+}
+
 std::vector<BluetoothLocalGattService*>
 BluetoothTestBase::RegisteredGattServices() {
   NOTIMPLEMENTED();