bluetooth: Require frame to be connected for stopNotifications to succeed.

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/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMDataView.h"
@@ skipping 337 matching lines @@
 ScriptPromise BluetoothRemoteGATTCharacteristic::stopNotifications(
     ScriptState* scriptState) {
 #if OS(MACOSX)
   // TODO(jlebel): Remove when stopNotifications is implemented.
   return ScriptPromise::rejectWithDOMException(
       scriptState, DOMException::create(NotSupportedError,
                                         "stopNotifications is not implemented "
                                         "yet. See https://goo.gl/J6ASzs"));
 #endif  // OS(MACOSX)
 
+  if (!gatt()->connected()) {
+    return ScriptPromise::rejectWithDOMException(
+        scriptState,
+        DOMException::create(NetworkError, kGATTServerNotConnected));
+  }
+
   WebBluetooth* webbluetooth =
       BluetoothSupplement::fromScriptState(scriptState);
   ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
   ScriptPromise promise = resolver->promise();
   webbluetooth->stopNotifications(m_webCharacteristic->characteristicInstanceID,
                                   new NotificationsCallback(this, resolver));
   return promise;
 }
 
 DEFINE_TRACE(BluetoothRemoteGATTCharacteristic) {
   visitor->trace(m_service);
   visitor->trace(m_properties);
   visitor->trace(m_value);
   EventTargetWithInlineData::trace(visitor);
   ActiveDOMObject::trace(visitor);
 }
 
 }  // namespace blink