Add url(… referrer-policy()) modifier

Author: ddbeck

css/types/url.json

@@ -75,6 +75,39 @@
               "deprecated": false
             }
           }
+        },
+        "referrer-policy": {
+          "__compat": {
+            "description": "`referrer-policy()` modifier",
+            "spec_url": "https://drafts.csswg.org/css-values-5/#typedef-request-url-modifier-referrer-policy-modifier",
+            "support": {
+              "chrome": {
+                "version_added": false,
+                "impl_url": "https://crbug.com/435625756"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "26.2"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }