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

third_party/WebKit/Source/modules/filesystem/FileWriter.cpp

 /*
  * Copyright (C) 2010 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 34 matching lines @@
 static const double progressNotificationIntervalMS = 50;
 
 FileWriter* FileWriter::create(ExecutionContext* context)
 {
     FileWriter* fileWriter = new FileWriter(context);
     fileWriter->suspendIfNeeded();
     return fileWriter;
 }
 
 FileWriter::FileWriter(ExecutionContext* context)
-    : ActiveDOMObject(context)
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(context)
     , m_readyState(INIT)
     , m_operationInProgress(OperationNone)
     , m_queuedOperation(OperationNone)
     , m_bytesWritten(0)
     , m_bytesToWrite(0)
     , m_truncateLength(-1)
     , m_numAborts(0)
     , m_recursionDepth(0)
     , m_lastProgressNotificationTimeMS(0)
     , m_asyncOperationId(0)
@@ skipping 256 matching lines @@
 DEFINE_TRACE(FileWriter)
 {
     visitor->trace(m_error);
     visitor->trace(m_blobBeingWritten);
     EventTargetWithInlineData::trace(visitor);
     FileWriterBase::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink