Implement WebBluetooth getDescriptor[s]

third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp

Index: third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
diff --git a/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp b/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
index a39f9536affcd882bf87360bb71ebee7769a3ed2..7485033fa7b51380574ee98eb9e53c1e81923293 100644
--- a/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
+++ b/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
@@ -63,6 +63,14 @@ bool BluetoothDevice::isValidCharacteristic(
       characteristicInstanceId);
 }
 
+BluetoothRemoteGATTDescriptor*
+BluetoothDevice::getOrCreateBluetoothRemoteGATTDescriptor(
+    mojom::blink::WebBluetoothRemoteGATTDescriptorPtr descriptor,
+    BluetoothRemoteGATTCharacteristic* characteristic) {
+  return m_attributeInstanceMap->getOrCreateBluetoothRemoteGATTDescriptor(
+      std::move(descriptor), characteristic);
+}
+
 void BluetoothDevice::dispose() {
   disconnectGATTIfConnected();
 }