Moved RootFrameViewport creation to happen after document attachment

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 2103 matching lines @@
     m_layoutView->compositor()->setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);
 
     ContainerNode::attach(context);
 
     // The TextAutosizer can't update layout view info while the Document is detached, so update now in case anything changed.
     if (TextAutosizer* autosizer = textAutosizer())
         autosizer->updatePageInfo();
 
     m_frame->selection().documentAttached(this);
     m_lifecycle.advanceTo(DocumentLifecycle::StyleClean);
+
+    if (FrameView* frameView = view())
+        frameView->didAttachDocument();

[tdresser, 2016/07/06 18:28:33]

I'd be just as happy with:
if (view())
  view()->didAttachDocument().

Either way.

[bokan, 2016/07/06 18:43:52]

Done.

 }
 
 void Document::detach(const AttachContext& context)
 {
     TRACE_EVENT0("blink", "Document::detach");
     RELEASE_ASSERT(!m_frame || m_frame->tree().childCount() == 0);
     if (!isActive())
         return;
 
     // Frame navigation can cause a new Document to be attached. Don't allow that, since that will
@@ skipping 3896 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