Make custom layout actually work.

sky/engine/core/rendering/RenderBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1271 matching lines @@
         // FIXME: This calculation is not patched for block-flow yet.
         // https://bugs.webkit.org/show_bug.cgi?id=46500
         computePositionedLogicalWidth(computedValues);
         return;
     }
 
     // If layout is limited to a subtree, the subtree root's logical width does not change.
     if (node() && view()->frameView() && view()->frameView()->layoutRoot(true) == this)
         return;
 
-    // The parent box is flexing us, so it has increased or decreased our
-    // width.  Use the width from the style context.
-    // FIXME: Account for block-flow in flexible boxes.
-    // https://bugs.webkit.org/show_bug.cgi?id=46418
-    if (hasOverrideWidth() && parent()->isFlexibleBox()) {
+    if (hasOverrideWidth()) {
         computedValues.m_extent = overrideLogicalContentWidth() + borderAndPaddingLogicalWidth();
         return;
     }
 
     bool treatAsReplaced = shouldComputeSizeAsReplaced();
 
     RenderStyle* styleToUse = style();
     Length logicalWidthLength = treatAsReplaced ? Length(computeReplacedLogicalWidth(), Fixed) : styleToUse->logicalWidth();
 
     RenderBlock* cb = containingBlock();
@@ skipping 1771 matching lines @@
 
 RenderBox::BoxDecorationData::BoxDecorationData(const RenderStyle& style)
 {
     backgroundColor = style.colorIncludingFallback(CSSPropertyBackgroundColor);
     hasBackground = backgroundColor.alpha() || style.hasBackgroundImage();
     ASSERT(hasBackground == style.hasBackground());
     hasBorder = style.hasBorder();
 }
 
 } // namespace blink