Unprefix CSS cursor values zoom-in and zoom-out

Source/core/css/CSSValueKeywords.in

 //
 // CSS value names
 //
 
 // The mode argument is used to limit the keyword to be used only for certain
 // CSSParserModes. Values that have the prefix -internal- are only allowed by
 // CSSParserModes listed in allowInternalPropertyAndValue()
 
 inherit
 initial
@@ skipping 354 matching lines @@
 pointer
 move
 vertical-text
 cell
 context-menu
 alias
 // copy
 progress
 no-drop
 not-allowed
--webkit-zoom-in
--webkit-zoom-out
+zoom-in
+zoom-out
 e-resize
 ne-resize
 nw-resize
 n-resize
 se-resize
 sw-resize
 s-resize
 w-resize
 ew-resize
 ns-resize
 nesw-resize
 nwse-resize
 col-resize
 row-resize
 text
 wait
 help
 all-scroll
 -webkit-grab
 -webkit-grabbing
+-webkit-zoom-in
+-webkit-zoom-out

[Julien - ping for review, 2014/05/19 09:17:55]

Would it be worth it to have the concept of alias_for= for keywords too? (we
have it for properties and it automates the conversion)

[philipj_slow, 2014/05/19 09:52:51]

AFAICT from the generated CSSPropertyNames.{h,cpp}, an aliased properties get no
CSSPropertyID of its own. Since UseCounter uses CSSPropertyID I don't know how
to add UseCounters for aliased properties, and assume the same problem would
happen for aliased value keywords?

I'm guessing an alias would also make both keywords both stringify to the
unprefixed keyword? Is that a change that can be made without any UseCounter
data?

[Julien - ping for review, 2014/05/21 11:38:10]

Yes but we could prevent this problem by having some translation code instead of
aliasing. This is not an issue for now as we don't UseCount CSSValueID.
Good point. Now that you mention it, CSS transition (that we are in the process
of unprefixing) is not using aliases for this reason. I can't recall what
motivated the decision but it's probably to be on the safe side.

[philipj_slow, 2014/05/21 11:57:59]

Do you mean a function like mapKeywordToAlias() that would be applied after
we've had a chance to notify UseCounter about the interesting bits? After this
has landed I'll submit a review with UseCounters for -webkit-zoom-in/out. I'll
add you to that review to see if you think there's a reasonable way to add
aliasing to the mix.

 // none
 //
 // CSS_PROP_DIRECTION:
 //
 ltr
 rtl
 //
 // CSS_PROP_TEXT_TRANSFORM:
 //
 capitalize
@@ skipping 614 matching lines @@
 safe
 
 // scroll-behavior
 instant
 smooth
 
 // will-change
 // auto
 contents
 scroll-position