Use Referrer-Policy headers for CSS stylesheets

third_party/WebKit/LayoutTests/external/wpt/referrer-policy/generic/subresource/stylesheet.py

+import os, sys, json
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+import subresource
+
+def generate_payload(request, server_data):
+    return subresource.get_template("stylesheet.css.template") % {"id": request.GET["id"]}
+
+def generate_import_rule(request, server_data):
+    data = "@import url('%(url)s?id=%(id)s');" % {
+        "id": request.GET["id"],
+        "url": subresource.create_redirect_url(request, cross_origin = True)
+    }
+    return data
+
+def main(request, response):
+    payload_generator = lambda data: generate_payload(request, data)
+    if "import-rule" in request.GET:
+        payload_generator = lambda data: generate_import_rule(request, data)
+
+    subresource.respond(
+        request,
+        response,
+        payload_generator = payload_generator,
+        content_type = "text/css",
+        maybe_additional_headers = { "Referrer-Policy": "unsafe-url" })
+