Enable CSSIntrinsicSize (aka contain-intrinsic-size)

Intent to Ship:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/Dbpth-n7LZo

R=chrishtr@chromium.org, vmpstr@chromium.org

Bug: 991096
Change-Id: Idb7ee2c2995841f185977dd12e52d9b62f60d139
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090019
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747401}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -444,7 +444,7 @@
       // https://wicg.github.io/display-locking/contain-intrinsic-size.html
       name: "CSSIntrinsicSize",
       implied_by: ["CSSSubtreeVisibility"],
-      status: "experimental",
+      status: "stable",
     },
     {
       name: "CSSLayoutAPI",

third_party/blink/web_tests/virtual/stable/webexposed/css-properties-as-js-properties-expected.txt

@@ -111,6 +111,7 @@ columnSpan
 columnWidth
 columns
 contain
+containIntrinsicSize
 content
 counterIncrement
 counterReset

third_party/blink/web_tests/virtual/stable/webexposed/css-property-listing-expected.txt

@@ -147,6 +147,7 @@ All changes to this list should go through Blink's feature review process: http:
     column-span
     column-width
     contain
+    contain-intrinsic-size
     content
     counter-increment
     counter-reset