bluetooth: Add characteristicvaluechanged event

third_party/WebKit/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/WebPassOwnPtr.h"
 #include "public/platform/WebString.h"
@@ skipping 68 matching lines @@
         WebBluetoothReadValueCallbacks*) { }
     virtual void writeValue(const WebString& characteristicInstanceID,
         const std::vector<uint8_t>& value,
         WebBluetoothWriteValueCallbacks*) { }
     virtual void startNotifications(const WebString& characteristicInstanceID,
         WebBluetoothGATTCharacteristic*,
         WebBluetoothNotificationsCallbacks*) {}
     virtual void stopNotifications(const WebString& characteristicInstanceID,
         WebBluetoothGATTCharacteristic*,
         WebBluetoothNotificationsCallbacks*) {}
+
+    // Called when addEventListener is called on a characteristic.
+    virtual void registerCharacteristicObject(
+        const WebString& characteristicInstanceID,
+        WebBluetoothGATTCharacteristic*) = 0;
     virtual void characteristicObjectRemoved(
         const WebString& characteristicInstanceID,
         WebBluetoothGATTCharacteristic*) {}
 };
 
 } // namespace blink
 
 #endif // WebBluetooth_h