RenderBlock::isSelfCollapsingBlock() should only be used when an object does not require layout.

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 56 matching lines @@
 #include "core/rendering/RenderMultiColumnBlock.h"
 #include "core/rendering/RenderNamedFlowThread.h"
 #include "core/rendering/RenderRegion.h"
 #include "core/rendering/RenderRuby.h"
 #include "core/rendering/RenderRubyText.h"
 #include "core/rendering/RenderScrollbarPart.h"
 #include "core/rendering/RenderTableCaption.h"
 #include "core/rendering/RenderTableCell.h"
 #include "core/rendering/RenderTableCol.h"
 #include "core/rendering/RenderTableRow.h"
+#include "core/rendering/RenderTextControlPlaceholder.h"
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/style/ContentData.h"
 #include "core/rendering/style/CursorList.h"
 #include "core/rendering/style/ShadowList.h"
 #include "core/rendering/svg/SVGRenderSupport.h"
 #include "platform/Partitions.h"
 #include "platform/geometry/TransformState.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "wtf/RefCountedLeakCounter.h"
@@ skipping 67 matching lines @@
         image->setStyleInternal(style);
         if (const StyleImage* styleImage = static_cast<const ImageContentData*>(contentData)->image()) {
             image->setImageResource(RenderImageResourceStyleImage::create(const_cast<StyleImage*>(styleImage)));
             image->setIsGeneratedContent();
         } else
             image->setImageResource(RenderImageResource::create());
         image->setStyleInternal(0);
         return image;
     }
 
+    if (element->shadowPseudoId() == "-webkit-input-placeholder")
+        return new RenderTextControlPlaceholder(element);
+
     if (element->hasTagName(rubyTag)) {
         if (style->display() == INLINE)
             return new RenderRubyAsInline(element);
         else if (style->display() == BLOCK)
             return new RenderRubyAsBlock(element);
     }
     // treat <rt> as ruby text ONLY if it still has its default treatment of block
     if (element->hasTagName(rtTag) && style->display() == BLOCK)
         return new RenderRubyText(element);
 
@@ skipping 3233 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif