Update parent layout when child frame requests innerHeight/innerWidth.

Source/core/html/HTMLFrameElementBase.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2008, 2009 Apple Inc. 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
  * License as published by the Free Software Foundation; either
@@ skipping 64 matching lines @@
     if (!isURLAllowed())
         return;
 
     if (m_URL.isEmpty())
         m_URL = blankURL().string();
 
     Frame* parentFrame = document()->frame();
     if (!parentFrame)
         return;
 
+    // Force layout before loading a subframe because the frame may need to know
+    // its dimensions and we don't want the frame to waste effort laying out
+    // with incorrect dimensions.
+    //
+    // FIXME: This is potentially too much work. We really only need to do
+    // enough to calculate the width and height of the subframe.
+    document()->updateLayoutIgnorePendingStylesheets();

[esprehn, 2013/07/16 00:49:41]

This isn't the right place to do this, you're going to cause hundreds of layouts
and recalc styles on pages with iframes as the parser appends them to the
document.

+
     parentFrame->loader()->subframeLoader()->requestFrame(this, m_URL, m_frameName, lockBackForwardList);
 }
 
 void HTMLFrameElementBase::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == srcdocAttr)
         setLocation("about:srcdoc");
     else if (name == srcAttr && !fastHasAttribute(srcdocAttr))
         setLocation(stripLeadingAndTrailingHTMLSpaces(value));
     else if (isIdAttributeName(name)) {
@@ skipping 127 matching lines @@
 
 int HTMLFrameElementBase::height()
 {
     document()->updateLayoutIgnorePendingStylesheets();
     if (!renderBox())
         return 0;
     return renderBox()->height();
 }
 
 } // namespace WebCore