Add UseCounter features for cursor values -webkit-zoom-in/out

Source/core/css/parser/CSSPropertyParser.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 649 matching lines @@
             if (!list)
                 list = CSSValueList::createCommaSeparated();
 
             if (image)
                 list->append(CSSCursorImageValue::create(image, hasHotSpot, hotSpot));
 
             if (!value || !(value->unit == CSSParserValue::Operator && value->iValue == ','))
                 return false;
             value = m_valueList->next(); // comma
         }
+        if (value && m_context.useCounter()) {
+            if (value->id == CSSValueWebkitZoomIn)
+                m_context.useCounter()->count(UseCounter::PrefixedCursorZoomIn);
+            else if (value->id == CSSValueWebkitZoomOut)
+                m_context.useCounter()->count(UseCounter::PrefixedCursorZoomOut);

[Julien - ping for review, 2014/05/23 09:47:35]

Ideally we would want to send a deprecation message but IIRC this was hard to do
without having to touch the whole parsing logic as we need an extra argument
(Document / DOMWindow or ExecutionContext).

[philipj_slow, 2014/05/23 10:50:46]

Oh, hadn't noticed that countDeprecation is going to require an extra argument.
With some luck the usage will be so low that direct removal is possible,
otherwise we'll have to figure something out when deprecating this in a few
months time.

+        }
         if (list) {
             if (!value)
                 return false;
             if (inQuirksMode() && value->id == CSSValueHand) // MSIE 5 compatibility :/
                 list->append(cssValuePool().createIdentifierValue(CSSValuePointer));
             else if ((value->id >= CSSValueAuto && value->id <= CSSValueWebkitZoomOut) || value->id == CSSValueCopy || value->id == CSSValueNone)
                 list->append(cssValuePool().createIdentifierValue(value->id));
             m_valueList->next();
             parsedValue = list.release();
             break;
@@ skipping 7826 matching lines @@
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueFill));
     if (!seenStroke)
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueStroke));
     if (!seenMarkers)
         parsedValues->append(CSSPrimitiveValue::createIdentifier(CSSValueMarkers));
 
     return parsedValues.release();
 }
 
 } // namespace WebCore