bluetooth: Stop firing value changed events after gatt disconnects

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

 // Copyright 2015 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.
 
 #include "modules/bluetooth/BluetoothRemoteGATTCharacteristic.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/events/Event.h"
 #include "core/inspector/ConsoleMessage.h"
@@ skipping 33 matching lines @@
   return new BluetoothRemoteGATTCharacteristic(
       context, std::move(characteristic), service, device);
 }
 
 void BluetoothRemoteGATTCharacteristic::setValue(DOMDataView* domDataView) {
   m_value = domDataView;
 }
 
 void BluetoothRemoteGATTCharacteristic::dispatchCharacteristicValueChanged(
     const Vector<uint8_t>& value) {
+  if (!getGatt()->connected())
+    return;
   this->setValue(BluetoothRemoteGATTUtils::ConvertWTFVectorToDataView(value));
   dispatchEvent(Event::create(EventTypeNames::characteristicvaluechanged));
 }
 
 void BluetoothRemoteGATTCharacteristic::contextDestroyed(ExecutionContext*) {
   notifyCharacteristicObjectRemoved();
 }
 
 void BluetoothRemoteGATTCharacteristic::dispose() {
   notifyCharacteristicObjectRemoved();
@@ skipping 366 matching lines @@
 DEFINE_TRACE(BluetoothRemoteGATTCharacteristic) {
   visitor->trace(m_service);
   visitor->trace(m_properties);
   visitor->trace(m_value);
   visitor->trace(m_device);
   EventTargetWithInlineData::trace(visitor);
   ContextLifecycleObserver::trace(visitor);
 }
 
 }  // namespace blink