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

third_party/WebKit/Source/core/streams/ReadableStreamReader.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 "core/streams/ReadableStreamReader.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ToV8.h"
 #include "bindings/core/v8/V8IteratorResultValue.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/streams/ReadableStream.h"
 
 namespace blink {
 
 ReadableStreamReader::ReadableStreamReader(ExecutionContext* executionContext, ReadableStream* stream)
-    : ActiveDOMObject(executionContext)
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(executionContext)
     , m_stream(stream)
     , m_closed(new ClosedPromise(executionContext, this, ClosedPromise::Closed))
 {
     suspendIfNeeded();
     ASSERT(m_stream->isLockedTo(nullptr));
     m_stream->setReader(this);
 
     if (m_stream->stateInternal() == ReadableStream::Closed)
         m_closed->resolve(ToV8UndefinedGenerator());
     if (m_stream->stateInternal() == ReadableStream::Errored)
@@ skipping 91 matching lines @@
 }
 
 DEFINE_TRACE(ReadableStreamReader)
 {
     visitor->trace(m_stream);
     visitor->trace(m_closed);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink