Recalc styles on resize if we have viewport units.

Source/WebCore/css/CSSGrammar.y.in

 /*
  *  Copyright (C) 2002-2003 Lars Knoll (knoll@kde.org)
  *  Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  *  Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *  Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  *  Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 1777 matching lines @@
   | QEMS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSParserValue::Q_EMS; }
   | EXS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_EXS; }
   | REMS maybe_space {
       $$.id = 0;
       $$.fValue = $1;
       $$.unit = CSSPrimitiveValue::CSS_REMS;
       if (parser->m_styleSheet)
           parser->m_styleSheet->parserSetUsesRemUnits(true);
   }
   | CHS maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_CHS; }
-  | VW maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_VW; }
-  | VH maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_VH; }
-  | VMIN maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_VMIN; }
-  | VMAX maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_VMAX; }
+  | VW maybe_space {
+      $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_VW;
+      if (parser->m_styleSheet)
+          parser->m_styleSheet->parserSetUsesViewportUnits(true);
+  }
+  | VH maybe_space {
+      $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_VH;
+      if (parser->m_styleSheet)
+          parser->m_styleSheet->parserSetUsesViewportUnits(true);
+  }
+  | VMIN maybe_space {
+      $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_VMIN;
+      if (parser->m_styleSheet)
+          parser->m_styleSheet->parserSetUsesViewportUnits(true);
+  }
+  | VMAX maybe_space {
+      $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_VMAX;
+      if (parser->m_styleSheet)
+          parser->m_styleSheet->parserSetUsesViewportUnits(true);
+  }
   | DPPX maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_DPPX; }
   | DPI maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_DPI; }
   | DPCM maybe_space { $$.id = 0; $$.fValue = $1; $$.unit = CSSPrimitiveValue::CSS_DPCM; }
   ;
 
 function:
     FUNCTION maybe_space expr ')' maybe_space {
         CSSParserFunction* f = parser->createFloatingFunction();
         f->name = $1;
         f->args = parser->sinkFloatingValueList($3);
@@ skipping 218 matching lines @@
     }
     ;
 
 error_location: {
         $$ = parser->currentLocation();
     }
     ;
 
 %%