Increment style version for all style changes.

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 1510 matching lines @@
 {
     ASSERT(!hasPendingStyleRecalc());
     ASSERT(shouldScheduleLayoutTreeUpdate());
     ASSERT(needsLayoutTreeUpdate());
 
     page()->animator().scheduleVisualUpdate();
     m_lifecycle.ensureStateAtMost(DocumentLifecycle::VisualUpdatePending);
 
     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "ScheduleStyleRecalculation", TRACE_EVENT_SCOPE_THREAD, "data", InspectorRecalculateStylesEvent::data(frame()));
     InspectorInstrumentation::didScheduleStyleRecalculation(this);
+
+    ++m_styleVersion;
 }
 
 bool Document::hasPendingForcedStyleRecalc() const
 {
     return hasPendingStyleRecalc() && !inStyleRecalc() && styleChangeType() >= SubtreeStyleChange;
 }
 
 void Document::updateStyleInvalidationIfNeeded()
 {
     ScriptForbiddenScope forbidScript;
@@ skipping 4195 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     Document::WeakDocumentSet& set = Document::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().string().utf8().data());
 }
 #endif