ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/imagecapture/ImageCapture.h

 // Copyright 2016 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 ImageCapture_h
 #define ImageCapture_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
 #include "media/capture/mojo/image_capture.mojom-blink.h"
 #include "modules/EventTargetModules.h"
 #include "modules/ModulesExport.h"
 #include "platform/AsyncMethodRunner.h"
 #include <memory>
 
 namespace blink {
 
 class ExceptionState;
 class MediaStreamTrack;
 class PhotoSettings;
 class WebImageCaptureFrameGrabber;
 
 // TODO(mcasas): Consideradding a LayoutTest checking that this class is not
 // garbage collected while it has event listeners.
-class MODULES_EXPORT ImageCapture final : public EventTargetWithInlineData,
-                                          public ActiveScriptWrappable,
-                                          public ContextLifecycleObserver {
+class MODULES_EXPORT ImageCapture final
+    : public EventTargetWithInlineData,
+      public ActiveScriptWrappable<ImageCapture>,
+      public ContextLifecycleObserver {
   USING_GARBAGE_COLLECTED_MIXIN(ImageCapture);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static ImageCapture* create(ExecutionContext*,
                               MediaStreamTrack*,
                               ExceptionState&);
   ~ImageCapture() override;
 
   // EventTarget implementation.
@@ skipping 30 matching lines @@
   Member<MediaStreamTrack> m_streamTrack;
   std::unique_ptr<WebImageCaptureFrameGrabber> m_frameGrabber;
   media::mojom::blink::ImageCapturePtr m_service;
 
   HeapHashSet<Member<ScriptPromiseResolver>> m_serviceRequests;
 };
 
 }  // namespace blink
 
 #endif  // ImageCapture_h