Add grid-gap, grid-column-gap, and grid-row-gap properties

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

@@ -5492,6 +5492,9 @@
         <value name="span" version="3.0" browsers="all" />
       </values>
     </entry>
+    <entry name="grid-column-gap" restriction="length" version="3.0" browsers="none" ref="http://www.w3.org/TR/css-grid-1/#propdef-grid-column-gap" syntax="#item1 { $(name): 2em; }">
+      <desc>Specifies the gutters between grid columns.</desc>
+    </entry>
     <entry name="grid-column-start" restriction="identifier, integer, enum" version="3.0" browsers="none" ref="http://www.w3.org/TR/css-grid-1/#propdef-grid-column-start" syntax="#item1 { $(name): span 2; }">
       <desc>Determine a grid item’s size and location within the grid by contributing a line, a span, or nothing (automatic) to its grid placement.</desc>
       <values>
@@ -5537,6 +5540,9 @@
         <value name="rows" version="3.0" browsers="all" />
       </values>
     </entry>
+    <entry name="grid-gap" restriction="length" version="3.0" browsers="none" ref="http://www.w3.org/TR/css-grid-1/#propdef-grid-gap" syntax="#item1 { $(name): 2em 1em; }">
+      <desc>Shorthand that specifies the gutters between grid columns and grid rows in one declaration.</desc>
+    </entry>
     <entry name="grid-row" restriction="identifier, integer, enum" version="3.0" browsers="none" ref="http://www.w3.org/TR/css-grid-1/#propdef-grid-row" syntax="#item1 { $(name): span 2 / auto; }">
       <desc>Shorthand for 'grid-row-start' and 'grid-row-end'.</desc>
       <values>
@@ -5551,6 +5557,9 @@
         <value name="span" version="3.0" browsers="all" />
       </values>
     </entry>
+    <entry name="grid-row-gap" restriction="length" version="3.0" browsers="none" ref="http://www.w3.org/TR/css-grid-1/#propdef-grid-row-gap" syntax="#item1 { $(name): 2em; }">
+      <desc>Specifies the gutters between grid rows.</desc>
+    </entry>
     <entry name="grid-row-start" restriction="identifier, integer, enum" version="3.0" browsers="none" ref="http://www.w3.org/TR/css-grid-1/#propdef-grid-row-start" syntax="#item1 { $(name): span 2; }">
       <desc>Determine a grid item’s size and location within the grid by contributing a line, a span, or nothing (automatic) to its grid placement.</desc>
       <values>