add pan-x and pan-y support to CSS touch-action parsing.

Source/core/css/resolver/StyleBuilderCustom.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
@@ skipping 546 matching lines @@
         return;
 
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
 
     if (primitiveValue->getValueID())
         return state.style()->setVerticalAlign(*primitiveValue);
 
     state.style()->setVerticalAlignLength(primitiveValue->convertToLength<FixedConversion | PercentConversion>(state.cssToLengthConversionData()));
 }
 
+void StyleBuilderFunctions::applyValueCSSPropertyTouchAction(StyleResolverState& state, CSSValue* value)
+{
+    TouchAction action = RenderStyle::initialTouchAction();
+    for (CSSValueListIterator i(value); i.hasMore(); i.advance()) {
+        CSSValue* item = i.value();
+        action |= *toCSSPrimitiveValue(item);

[Rick Byers, 2013/12/10 21:57:14]

The other indication that this should be calling your touch-action conversion
routines directly is that we should make it clear here that only the
touch-action values are permitted (eg. what would it mean if there was a length
value or something here?).  Hopefully this falls out cleanly from the removal of
the value conversion functions.

+    }
+    state.style()->setTouchAction(action);
+}
+
 static void resetEffectiveZoom(StyleResolverState& state)
 {
     // Reset the zoom in effect. This allows the setZoom method to accurately compute a new zoom in effect.
     state.setEffectiveZoom(state.parentStyle() ? state.parentStyle()->effectiveZoom() : RenderStyle::initialZoom());
 }
 
 void StyleBuilderFunctions::applyInitialCSSPropertyZoom(StyleResolverState& state)
 {
     resetEffectiveZoom(state);
     state.setZoom(RenderStyle::initialZoom());
@@ skipping 1593 matching lines @@
         break;
     }
     case CSSPropertyEnableBackground:
         // Silently ignoring this property for now
         // http://bugs.webkit.org/show_bug.cgi?id=6022
         break;
     }
 }
 
 } // namespace WebCore