[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/modules/netinfo/NetworkInformation.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 NetworkInformation_h
 #define NetworkInformation_h
 
+#include "bindings/core/v8/V8GCRoot.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/events/EventTarget.h"
 #include "core/page/NetworkStateNotifier.h"
 #include "public/platform/WebConnectionType.h"
 
 namespace blink {
 
 class ExecutionContext;
 
 class NetworkInformation final
     : public RefCountedGarbageCollectedEventTargetWithInlineData<NetworkInformation>
     , public ActiveDOMObject
-    , public NetworkStateNotifier::NetworkStateObserver {
+    , public NetworkStateNotifier::NetworkStateObserver
+    , public V8GCRoot {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(NetworkInformation);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NetworkInformation);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static NetworkInformation* create(ExecutionContext*);
     ~NetworkInformation() override;
 
     String type() const;
     double downlinkMax() const;
 
@@ skipping 33 matching lines @@
     // Whether this object is listening for events from NetworkStateNotifier.
     bool m_observing;
 
     // Whether ActiveDOMObject::stop has been called.
     bool m_contextStopped;
 };
 
 } // namespace blink
 
 #endif // NetworkInformation_h