[Experiment] purge-and-suspend

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 5926 matching lines @@
 
     if (order > m_shadowCascadeOrder)
         m_shadowCascadeOrder = order;
 }
 
 LayoutViewItem Document::layoutViewItem() const
 {
     return LayoutViewItem(m_layoutView);
 }
 
+void Document::purgeMemory()
+{
+    m_styleEngine->purgeMemory();
+    if (&axObjectCacheOwner() == this)
+        clearAXObjectCache();
+
+    if (m_fetcher)
+        m_fetcher->purgeMemory();
+
+    m_selectorQueryCache.reset();
+    m_canvasFontCache.clear();
+    m_mediaQueryMatcher.clear();
+}
+
 DEFINE_TRACE(Document)
 {
     visitor->trace(m_importsController);
     visitor->trace(m_docType);
     visitor->trace(m_implementation);
     visitor->trace(m_autofocusElement);
     visitor->trace(m_focusedElement);
     visitor->trace(m_sequentialFocusNavigationStartingPoint);
     visitor->trace(m_hoverNode);
     visitor->trace(m_activeHoverElement);
@@ skipping 82 matching lines @@
 }
 
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().getString().utf8().data());
 }
 #endif