bluetooth: Add BluetoothGATTCharacteristic IDL and Blink interface

public/platform/modules/bluetooth/WebBluetooth.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebBluetooth_h
 #define WebBluetooth_h
 
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/WebString.h"
 
 namespace blink {
 
 struct WebBluetoothDevice;
 struct WebBluetoothError;
+struct WebBluetoothGATTCharacteristic;
 struct WebBluetoothGATTRemoteServer;
 struct WebBluetoothGATTService;
 
 // Success and failure callbacks for requestDevice.
-// WebBluetoothDevice and WebBluetoothError object ownership is transfered.
+// WebBluetoothDevice and WebBluetoothError object ownership is transferred.
 typedef WebCallbacks<WebBluetoothDevice, WebBluetoothError> WebBluetoothRequestDeviceCallbacks;
 
 // Success and failure callbacks for connectGATT.
+// WebBluetoothGATTRemoteServer and WebBluetoothError object ownership is transferred.
 typedef WebCallbacks<WebBluetoothGATTRemoteServer, WebBluetoothError> WebBluetoothConnectGATTCallbacks;
 
 // Success and failure callbacks for getPrimaryService.
+// WebBluetoothGATTService and WebBluetoothError object ownership is transferred.
 typedef WebCallbacks<WebBluetoothGATTService, WebBluetoothError> WebBluetoothGetPrimaryServiceCallbacks;
 
+// Success and failure callbacks for getCharacteristic.
+// WebBluetoothCharacteristic and WebBluetoothError object ownership is transferred.
+typedef WebCallbacks<WebBluetoothGATTCharacteristic, WebBluetoothError> WebBluetoothGetCharacteristicCallbacks;
+
 class WebBluetooth {
 public:
     virtual ~WebBluetooth() { }
 
     // BluetoothDiscovery Methods:
     // See https://webbluetoothcg.github.io/web-bluetooth/#idl-def-bluetoothdiscovery
     // WebBluetoothRequestDeviceCallbacks ownership transferred to the client.
     virtual void requestDevice(WebBluetoothRequestDeviceCallbacks*) = 0;
 
     // BluetoothDevice methods:
     // See https://webbluetoothcg.github.io/web-bluetooth/#idl-def-bluetoothdevice
     // WebBluetoothConnectGATTCallbacks ownership transferred to the callee.
     virtual void connectGATT(const WebString& /* deviceInstanceID */,
         WebBluetoothConnectGATTCallbacks*) { }
 
     // BluetoothGATTRemoteServer methods:
     // See https://webbluetoothcg.github.io/web-bluetooth/#idl-def-bluetoothgattremoteserver
     virtual void disconnect() { }
     virtual void getPrimaryService(const WebString& deviceInstanceID,
         const WebString& serviceUUID,
         WebBluetoothGetPrimaryServiceCallbacks*) { }
     // virtual void getPrimaryServices() { }
+
+    // BluetoothGATTService methods:
+    // See https://webbluetoothcg.github.io/web-bluetooth/#idl-def-bluetoothgattservice
+    virtual void getCharacteristic(const WebString& serviceInstanceID,
+        const WebString& characteristicUUID,
+        WebBluetoothGetCharacteristicCallbacks*) { }
 };
 
 } // namespace blink
 
 #endif // WebBluetooth_h