Clear matched properties cache for theme color 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 5718 matching lines @@
 
     return false;
 }
 
 void Document::invalidateNodeListCaches(const QualifiedName* attrName)
 {
     for (const LiveNodeListBase* list : m_listsInvalidatedAtDocument)
         list->invalidateCacheForAttribute(attrName);
 }
 
+void Document::platformColorsChanged()
+{
+    if (!isActive())
+        return;
+
+    styleEngine()->platformColorsChanged();
+}
+
 void Document::clearWeakMembers(Visitor* visitor)
 {
     if (m_axObjectCache)
         m_axObjectCache->clearWeakMembers(visitor);
 }
 
 v8::Handle<v8::Object> Document::wrap(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     // It's possible that no one except for the new wrapper owns this object at
     // this moment, so we have to prevent GC to collect this object until the
@@ skipping 92 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 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().string().utf8().data());
 }
 #endif