Add a WebDocument::watchCssSelectors(selectors)

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 767 matching lines @@
     }
     case CSSPropertyWebkitTapHighlightColor: {
         HANDLE_INHERIT_AND_INITIAL(tapHighlightColor, TapHighlightColor);
         if (!primitiveValue)
             break;
 
         Color col = state.document()->textLinkColors().colorFromPrimitiveValue(primitiveValue, state.style()->visitedDependentColor(CSSPropertyColor));
         state.style()->setTapHighlightColor(col);
         return;
     }
+#if ENABLE(CSS_CALLBACKS)
+    case CSSPropertyInternalCallback: {
+        if (isInherit || isInitial)
+            return;
+        if (primitiveValue) {

[esprehn, 2013/07/13 01:43:01]

if (primitiveValue && primitiveValue->getValueID())
  state.style()->addCallbackSelector( ... );

Since you only allow one value would be simpler

[Jeffrey Yasskin, 2013/08/13 00:29:29]

Done.

+            switch (primitiveValue->getValueID()) {
+            case CSSValueInternalPresence:
+                state.style()->addCallbackSelector(
+                    state.rule()->selectorList().selectorsText(),
+                    state.element()->document());
+                return;
+            default:
+                break;
+            }
+        }
+        break;
+    }
+#endif
     case CSSPropertyInvalid:
         return;
     // Directional properties are resolved by resolveDirectionAwareProperty() before the switch.
     case CSSPropertyWebkitBorderEndColor:
     case CSSPropertyWebkitBorderEndStyle:
     case CSSPropertyWebkitBorderEndWidth:
     case CSSPropertyWebkitBorderStartColor:
     case CSSPropertyWebkitBorderStartStyle:
     case CSSPropertyWebkitBorderStartWidth:
     case CSSPropertyWebkitBorderBeforeColor:
@@ skipping 834 matching lines @@
     case CSSPropertyMaskType: {
         HANDLE_SVG_INHERIT_AND_INITIAL(maskType, MaskType)
         if (primitiveValue)
             state.style()->accessSVGStyle()->setMaskType(*primitiveValue);
         break;
     }
     }
 }
 
 } // namespace WebCore