Add line-snap property

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

@@ -6053,6 +6053,14 @@
         </value>
       </values>
     </entry>
+    <entry name="line-snap" restriction="enum" version="3.0" browsers="none" ref="http://www.w3.org/TR/css-line-grid-1/#propdef-line-snap" syntax="div { $(name): baseline; }">
+      <desc>Snaps line boxes contained by the element to the line grid specified by the 'line-grid' property.</desc>
+      <values>
+        <value name="none" version="3.0" browsers="all" />
+        <value name="baseline" version="3.0" browsers="all" />
+				<value name="contain" version="3.0" browsers="all" />
+      </values>
+    </entry>
     <entry name="list-style" restriction="enum, url" version="1.0" browsers="all" ref="http://www.w3.org/TR/css3-lists/#list-style" syntax="ul { $(name): square url('square.png');}">
       <desc>Shorthand for setting 'list-style-type', 'list-style-position' and 'list-style-image'</desc>
       <values>