introduce DocumentParserClient to receive parser stopped notification

Source/core/dom/DocumentParser.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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/DocumentParser.h"
 
 #include "core/dom/Document.h"
+#include "core/dom/DocumentParserClient.h"
 #include "core/html/parser/TextResourceDecoder.h"
 #include "wtf/Assertions.h"
 
 namespace blink {
 
 DocumentParser::DocumentParser(Document* document)
     : m_state(ParsingState)
     , m_documentWasLoadedAsPartOfNavigation(false)
     , m_document(document)
 {
     ASSERT(document);
 }
 
 DocumentParser::~DocumentParser()
 {
 #if !ENABLE(OILPAN)
     // Document is expected to call detach() before releasing its ref.
     // This ASSERT is slightly awkward for parsers with a fragment case
     // as there is no Document to release the ref.
     ASSERT(!m_document);
 #endif
 }
 
 void DocumentParser::trace(Visitor* visitor)
 {
     visitor->trace(m_document);
+#if ENABLE(OILPAN)
+    visitor->trace(m_clients);
+#endif
 }
 
 void DocumentParser::setDecoder(PassOwnPtr<TextResourceDecoder>)
 {
     ASSERT_NOT_REACHED();
 }
 
 TextResourceDecoder* DocumentParser::decoder()
 {
     return 0;
 }
 
 void DocumentParser::prepareToStopParsing()
 {
     ASSERT(m_state == ParsingState);
     m_state = StoppingState;
 }
 
 void DocumentParser::stopParsing()
 {
     m_state = StoppedState;
+
+    // Clients may be removed while in the loop. Make a snapshot for iteration.
+    WillBeHeapVector<RawPtrWillBeMember<DocumentParserClient> > clientsSnapshot;
+    copyToVector(m_clients, clientsSnapshot);
+
+    for (WillBeHeapVector<RawPtrWillBeMember<DocumentParserClient> >::const_iterator it = clientsSnapshot.begin(), itEnd = clientsSnapshot.end(); it != itEnd; ++it) {
+        DocumentParserClient* client = *it;
+        if (!m_clients.contains(client))
+            continue;
+
+        client->notifyParserStopped();
+    }
 }
 
 void DocumentParser::detach()
 {
     m_state = DetachedState;
     m_document = nullptr;
 }
 
 void DocumentParser::suspendScheduledTasks()
 {
 }
 
 void DocumentParser::resumeScheduledTasks()
 {
 }
 
+void DocumentParser::addClient(DocumentParserClient* client)
+{
+    m_clients.add(client);
+}
+
+void DocumentParser::removeClient(DocumentParserClient* client)
+{
+    m_clients.remove(client);
+}
+
 };