Implement WebBluetooth getDescriptor[s]

third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTCharacteristic.h

Index: third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTCharacteristic.h
diff --git a/third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTCharacteristic.h b/third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTCharacteristic.h
index 7b5c570703b7dd5d1cb027ef1671336dc2d69945..2a4e39f423381613db9f211a4f7d224c6872fe42 100644
--- a/third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTCharacteristic.h
+++ b/third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTCharacteristic.h
@@ -80,6 +80,13 @@ class BluetoothRemoteGATTCharacteristic final
   String uuid() { return m_webCharacteristic->uuid; }
   BluetoothCharacteristicProperties* properties() { return m_properties; }
   DOMDataView* value() const { return m_value; }
+  ScriptPromise getDescriptor(ScriptState*,
+                              const StringOrUnsignedLong& descriptor,
+                              ExceptionState&);
+  ScriptPromise getDescriptors(ScriptState*, ExceptionState&);
+  ScriptPromise getDescriptors(ScriptState*,
+                               const StringOrUnsignedLong& descriptor,
+                               ExceptionState&);
   ScriptPromise readValue(ScriptState*);
   ScriptPromise writeValue(ScriptState*, const DOMArrayPiece&);
   ScriptPromise startNotifications(ScriptState*);
@@ -93,12 +100,18 @@ class BluetoothRemoteGATTCharacteristic final
                           RegisteredEventListener&) override;
 
  private:
-  friend class ReadValueCallback;
-  friend class WriteValueCallback;
+  friend class CharacteristicReadValueCallback;
+  friend class CharacteristicWriteValueCallback;
   friend class NotificationsCallback;
+  friend class GetDescriptorsCallback;
+  friend class BluetoothRemoteGATTDescriptor;
 
   BluetoothRemoteGATTServer* gatt() { return m_service->device()->gatt(); }
 
+  ScriptPromise getDescriptorsImpl(ScriptState*,
+                                   mojom::blink::WebBluetoothGATTQueryQuantity,
+                                   const String& descriptorUUID = String());
+
   std::unique_ptr<WebBluetoothRemoteGATTCharacteristicInit> m_webCharacteristic;
   Member<BluetoothRemoteGATTService> m_service;
   bool m_stopped;