Begin removing the style recalc timer

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 1511 matching lines @@
 {
     if (!root) {
         exceptionState.throwDOMException(NotSupportedError, "The provided node is invalid.");
         return 0;
     }
     return TreeWalker::create(root, whatToShow, filter);
 }
 
 void Document::scheduleStyleRecalc()
 {
+    if (!isActive())
+        return;
+
     if (shouldDisplaySeamlesslyWithParent()) {
         // When we're seamless, our parent document manages our style recalcs.
         ownerElement()->setNeedsStyleRecalc();
         ownerElement()->document().scheduleStyleRecalc();
         return;
     }
 
-    if (m_styleRecalcTimer.isActive())
+    if (m_styleRecalcTimer.isActive() || !shouldScheduleLayout())

[esprehn, 2014/01/23 22:13:00]

Are we sure this is safe? It means we'll fail to schedule a style recalc while
sheets are loading. When the sheets are done loading what will schedule the
recalc?

(I don't think you can do this, if the stylesheet was empty we'd never schedule
a recalc at all)

[abarth-chromium, 2014/01/23 22:22:53]

Nope.
Won't we kick off the process in DOMContentLoaded?
Maybe the better thing to do is to request an animation frame just after
DOMContentLoaded?

         return;
 
     ASSERT(needsStyleRecalc() || childNeedsStyleRecalc() || childNeedsDistributionRecalc() || !m_useElementsNeedingUpdate.isEmpty());
 
     m_styleRecalcTimer.startOneShot(0);
 
     InspectorInstrumentation::didScheduleStyleRecalculation(this);
 }
 
 void Document::unscheduleStyleRecalc()
@@ skipping 3805 matching lines @@
     if (!page->focusController().isActive() || !page->focusController().isFocused())
         return false;
     if (Frame* focusedFrame = page->focusController().focusedFrame()) {
         if (focusedFrame->tree().isDescendantOf(frame()))
             return true;
     }
     return false;
 }
 
 } // namespace WebCore