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 7f71ff632c2084c66b6902354156d051b838828f..4c8cfd7a5832fb86bdb9a1d7754c95599c605708 100644
--- a/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
+++ b/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
@@ -65,6 +65,18 @@ bool BluetoothDevice::isValidCharacteristic(
       characteristicInstanceId);
 }
 
+BluetoothRemoteGATTDescriptor*
+BluetoothDevice::getOrCreateBluetoothRemoteGATTDescriptor(
+    std::unique_ptr<WebBluetoothRemoteGATTDescriptorInit> webDescriptor,
+    BluetoothRemoteGATTCharacteristic* characteristic) {
+  return m_attributeInstanceMap->getOrCreateBluetoothRemoteGATTDescriptor(
+      std::move(webDescriptor), characteristic);
+}
+
+bool BluetoothDevice::isValidDescriptor(const String& descriptorInstanceId) {
+  return m_attributeInstanceMap->containsDescriptor(descriptorInstanceId);
+}
+
 void BluetoothDevice::dispose() {
   disconnectGATTIfConnected();
 }