Make it possible to custom-paint without an Element.

sky/engine/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 86 matching lines @@
 #include "sky/engine/core/html/parser/NestingLevelIncrementer.h"
 #include "sky/engine/core/html/parser/TextResourceDecoder.h"
 #include "sky/engine/core/inspector/ConsoleMessage.h"
 #include "sky/engine/core/inspector/InspectorCounters.h"
 #include "sky/engine/core/loader/FrameLoaderClient.h"
 #include "sky/engine/core/loader/ImageLoader.h"
 #include "sky/engine/core/page/ChromeClient.h"
 #include "sky/engine/core/page/EventHandler.h"
 #include "sky/engine/core/page/FocusController.h"
 #include "sky/engine/core/page/Page.h"
+#include "sky/engine/core/painting/PaintingTasks.h"
+#include "sky/engine/core/painting/Picture.h"
 #include "sky/engine/core/rendering/HitTestResult.h"
 #include "sky/engine/core/rendering/RenderView.h"
 #include "sky/engine/platform/DateComponents.h"
 #include "sky/engine/platform/EventDispatchForbiddenScope.h"
 #include "sky/engine/platform/Language.h"
 #include "sky/engine/platform/Logging.h"
 #include "sky/engine/platform/ScriptForbiddenScope.h"
 #include "sky/engine/platform/TraceEvent.h"
 #include "sky/engine/platform/network/HTTPParsers.h"
 #include "sky/engine/platform/text/SegmentedString.h"
@@ skipping 2080 matching lines @@
 {
     Page* page = this->page();
     if (!page)
         return false;
     if (!page->focusController().isActive() || !page->focusController().isFocused())
         return false;
     Frame* focusedFrame = page->focusController().focusedFrame();
     return focusedFrame && focusedFrame == frame();
 }
 
+Picture* Document::rootPicture() const
+{
+    return m_picture.get();
+}
+
+void Document::setRootPicture(PassRefPtr<Picture> picture)
+{
+    m_picture = picture;
+    if (m_picture)
+        PaintingTasks::enqueueCommit(this, m_picture->displayList());
+    scheduleVisualUpdate();
+}
+
 } // namespace blink
 
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (WeakDocumentSet::const_iterator it = set.begin(); it != set.end(); ++it) {
         fprintf(stderr, "- Document %p URL: %s\n", *it, (*it)->url().string().utf8().data());
     }
 }
 #endif