Move the CSS Device Adaptation @viewport rule support behind a runtime flag

Source/core/css/resolver/ViewportStyleResolver.cpp

 /*
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 12 matching lines @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/css/resolver/ViewportStyleResolver.h"
 
-#if ENABLE(CSS_DEVICE_ADAPTATION)
-
 #include "CSSValueKeywords.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRule.h"
 #include "core/dom/Document.h"
+#include "core/dom/NodeRenderStyle.h"
 #include "core/dom/ViewportArguments.h"
 #include "core/page/Page.h"
 #include "core/rendering/RenderView.h"
 
 namespace WebCore {
 
 ViewportStyleResolver::ViewportStyleResolver(Document* document)
     : m_document(document)
 {
     ASSERT(m_document);
@@ skipping 86 matching lines @@
         case CSSPropertyMaxZoom:
         case CSSPropertyMinZoom:
         case CSSPropertyZoom:
             return percentValue;
         default:
             ASSERT_NOT_REACHED();
             break;
         }
     }
 
-    switch (primitiveValue->getIdent()) {
+    switch (primitiveValue->getValueID()) {
     case CSSValueAuto:
         return defaultValue;
     case CSSValueDeviceHeight:
         return ViewportArguments::ValueDeviceHeight;
     case CSSValueDeviceWidth:
         return ViewportArguments::ValueDeviceWidth;
     case CSSValueLandscape:
         return ViewportArguments::ValueLandscape;
     case CSSValuePortrait:
         return ViewportArguments::ValuePortrait;
     case CSSValueZoom:
         return defaultValue;
     case CSSValueFixed:
         return 0;
     default:
         return defaultValue;
     }
 }
 
 } // namespace WebCore
-
-#endif // ENABLE(CSS_DEVICE_ADAPTATION)