Update vertical-align to latest spec

src/vs/languages/css/common/buildscripts/css-schema.xml

@@ -16760,6 +16760,9 @@
     <entry name="vertical-align" restriction="percentage, length" version="1.0" browsers="all" ref="http://www.w3.org/TR/css3-linebox/#vertical-align" syntax="div { $(name): middle; }">
       <desc>Affects the vertical positioning of the inline boxes generated by an inline-level element inside a line box.</desc>
       <values>
+        <value name="alphabetic" version="3.0" browsers="none">
+          <desc>Match the box’s alphabetic baseline to that of its parent.</desc>
+        </value>
         <value name="auto" version="3.0" browsers="all">
           <desc>Align the dominant baseline of the parent box with the equivalent, or heuristically reconstructed, baseline of the element inline box.</desc>
         </value>
@@ -16769,9 +16772,15 @@
         <value name="bottom" version="1.0" browsers="all">
           <desc>Align the after edge of the extended inline box with the after-edge of the line box.</desc>
         </value>
+        <value name="center" version="3.0" browsers="none">
+          <desc>Align the center of the aligned subtree with the center of the line box.</desc>
+        </value>
         <value name="central" version="3.0" browsers="none">
           <desc>Align the 'central' baseline of the inline element with the central baseline of the parent.</desc>
         </value>
+        <value name="mathematical" version="3.0" browsers="none">
+          <desc>Match the box’s mathematical baseline to that of its parent.</desc>
+        </value>
         <value name="middle" version="3.0" browsers="all">
           <desc>Align the 'middle' baseline of the inline element with the middle baseline of the parent.</desc>
         </value>
@@ -16790,9 +16799,6 @@
         <value name="top" version="1.0" browsers="all">
           <desc>Align the before edge of the extended inline box with the before-edge of the line box.</desc>
         </value>
-        <value name="use-script" version="3.0" browsers="none">
-          <desc>Align the script preferred baseline of the element (determined by the computed script value) with the equivalent baseline of the parent element.</desc>
-        </value>
         <value name="-webkit-baseline-middle" version="2.0" browsers="C,S1" />
       </values>
     </entry>