Read the default min-width value from the UA style sheets

Source/core/html/HTMLMetaElement-in.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2010 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 370 matching lines @@
         message.replace("%replacement2", replacement2);
 
     // FIXME: This message should be moved off the console once a solution to https://bugs.webkit.org/show_bug.cgi?id=103274 exists.
     document().addConsoleMessage(RenderingMessageSource, viewportErrorMessageLevel(errorCode), message);
 }
 
 void HTMLMetaElement::processViewportContentAttribute(const String& content, ViewportDescription::Type origin)
 {
     ASSERT(!content.isNull());
 
-    if (!document().settings())
-        return;
-
     if (!document().shouldOverrideLegacyDescription(origin))
         return;
 
     ViewportDescription descriptionFromLegacyTag(origin);
     if (document().shouldMergeWithLegacyDescription(origin))
         descriptionFromLegacyTag = document().viewportDescription();
 
     parseContentAttribute(content, &HTMLMetaElement::processViewportKeyValuePair, (void*)&descriptionFromLegacyTag);
 
     if (descriptionFromLegacyTag.minZoom == ViewportDescription::ValueAuto)
         descriptionFromLegacyTag.minZoom = 0.25;
 
     if (descriptionFromLegacyTag.maxZoom == ViewportDescription::ValueAuto) {
         descriptionFromLegacyTag.maxZoom = 5;
         descriptionFromLegacyTag.minZoom = std::min(descriptionFromLegacyTag.minZoom, float(5));
     }
 
-    const Settings* settings = document().settings();
-
     if (descriptionFromLegacyTag.maxWidth.isAuto()) {
         if (descriptionFromLegacyTag.zoom == ViewportDescription::ValueAuto) {
             descriptionFromLegacyTag.minWidth = Length(ExtendToZoom);
-            descriptionFromLegacyTag.maxWidth = Length(settings->layoutFallbackWidth(), Fixed);
+            if (!document().viewportDefaultMinWidth().isAuto())
+                descriptionFromLegacyTag.maxWidth = document().viewportDefaultMinWidth();

[apavlov, 2014/03/31 16:47:19]

This is slightly confusing (foo.maxWidth = bar.minWidth()). Do you mind adding a
short comment here?

[kenneth.r.christiansen, 2014/03/31 20:37:09]

Done.

+            else
+                descriptionFromLegacyTag.maxWidth = Length(ExtendToZoom);
         } else if (descriptionFromLegacyTag.maxHeight.isAuto()) {
             descriptionFromLegacyTag.minWidth = Length(ExtendToZoom);
             descriptionFromLegacyTag.maxWidth = Length(ExtendToZoom);
         }
     }
 
     document().setViewportDescription(descriptionFromLegacyTag);
 }
 
 
@@ skipping 68 matching lines @@
 {
     return getAttribute(http_equivAttr);
 }
 
 const AtomicString& HTMLMetaElement::name() const
 {
     return getNameAttribute();
 }
 
 }