Add a FOUC painting test.

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 321 matching lines @@
 
 static bool acceptsEditingFocus(const Element& element)
 {
     ASSERT(element.hasEditableStyle());
 
     return element.document().frame() && element.rootEditableElement();
 }
 
 uint64_t Document::s_globalTreeVersion = 0;
 
-static bool s_threadedParsingEnabledForUnitTests = true;
+static bool s_threadedParsingEnabledForTesting = true;
 
 Document::WeakDocumentSet& Document::liveDocumentSet()
 {
     DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<WeakDocumentSet>, set, (adoptPtrWillBeNoop(new WeakDocumentSet())));
     return *set;
 }
 
 // This class doesn't work with non-Document ExecutionContext.
 class AutofocusTask final : public ExecutionContextTask {
 public:
@@ skipping 2027 matching lines @@
 
 PassRefPtrWillBeRawPtr<DocumentParser> Document::implicitOpen(ParserSynchronizationPolicy parserSyncPolicy)
 {
     cancelParsing();
 
     removeChildren();
     ASSERT(!m_focusedElement);
 
     setCompatibilityMode(NoQuirksMode);
 
-    if (!threadedParsingEnabledForUnitTestsOnly())
+    if (!threadedParsingEnabledForTesting())
         parserSyncPolicy = ForceSynchronousParsing;
 
     m_parserSyncPolicy = parserSyncPolicy;
     m_parser = createParser();
     setParsingState(Parsing);
     setReadyState(Loading);
 
     return m_parser;
 }
 
@@ skipping 2828 matching lines @@
 void Document::adjustFloatRectForScrollAndAbsoluteZoom(FloatRect& rect, LayoutObject& layoutObject)
 {
     if (!view())
         return;
 
     LayoutRect visibleContentRect(view()->visibleContentRect());
     rect.move(-FloatSize(visibleContentRect.x().toFloat(), visibleContentRect.y().toFloat()));
     adjustFloatRectForAbsoluteZoom(rect, layoutObject);
 }
 
-void Document::setThreadedParsingEnabledForUnitTestsOnly(bool enabled)
+void Document::setThreadedParsingEnabledForTesting(bool enabled)
 {
-    s_threadedParsingEnabledForUnitTests = enabled;
+    s_threadedParsingEnabledForTesting = enabled;
 }
 
-bool Document::threadedParsingEnabledForUnitTestsOnly()
+bool Document::threadedParsingEnabledForTesting()
 {
-    return s_threadedParsingEnabledForUnitTests;
+    return s_threadedParsingEnabledForTesting;
 }
 
 bool Document::hasActiveParser()
 {
     return m_activeParserCount || (m_parser && m_parser->processingData());
 }
 
 void Document::setContextFeatures(ContextFeatures& features)
 {
     m_contextFeatures = PassRefPtrWillBeRawPtr<ContextFeatures>(features);
@@ skipping 467 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