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

third_party/WebKit/Source/modules/battery/BatteryManager.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 BatteryManager_h
 #define BatteryManager_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseProperty.h"
+#include "bindings/core/v8/V8GCRoot.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/frame/PlatformEventController.h"
 #include "modules/EventTargetModules.h"
 #include "platform/battery/battery_status.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-class BatteryManager final : public RefCountedGarbageCollectedEventTargetWithInlineData<BatteryManager>, public ActiveDOMObject, public PlatformEventController {
+class BatteryManager final : public RefCountedGarbageCollectedEventTargetWithInlineData<BatteryManager>, public ActiveDOMObject, public PlatformEventController, public V8GCRoot {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(BatteryManager);
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(BatteryManager);
 public:
     static BatteryManager* create(ExecutionContext*);
     ~BatteryManager() override;
 
     // Returns a promise object that will be resolved with this BatteryManager.
     ScriptPromise startRequest(ScriptState*);
 
@@ skipping 29 matching lines @@
     explicit BatteryManager(ExecutionContext*);
 
     using BatteryProperty = ScriptPromiseProperty<Member<BatteryManager>, Member<BatteryManager>, Member<DOMException>>;
     Member<BatteryProperty> m_batteryProperty;
     BatteryStatus m_batteryStatus;
 };
 
 } // namespace blink
 
 #endif // BatteryManager_h