import from UXP:

- Issue #1230 - Part 1: Fix Back-computing percentages for intrinsic sizing in Layout CSS-Grid (e4c397f0)
- Issue #1230 - Part 2: Align devtools to the changes in css-grid (bbb8b649)
- Issue #1230 - Part 3: Update Reftests (4bc299bb)

devtools/shared/css/generated/properties-db.js

@@ -777,7 +777,8 @@ exports.CSS_PROPERTIES = {
       "column-gap"
     ],
     "supports": [
-      6
+      6,
+      8
     ],
     "values": [
       "calc",
@@ -5421,7 +5422,8 @@ exports.CSS_PROPERTIES = {
       "column-gap"
     ],
     "supports": [
-      6
+      6,
+      8
     ],
     "values": [
       "calc",