Add the 'cache' datatype to the clear-site-data WPT

third_party/WebKit/LayoutTests/external/wpt/clear-site-data/support/get-resource-to-cache.py

Index: third_party/WebKit/LayoutTests/external/wpt/clear-site-data/support/get-resource-to-cache.py
diff --git a/third_party/WebKit/LayoutTests/external/wpt/clear-site-data/support/get-resource-to-cache.py b/third_party/WebKit/LayoutTests/external/wpt/clear-site-data/support/get-resource-to-cache.py
new file mode 100644
index 0000000000000000000000000000000000000000..ff4254b75197cbd02c870ebc49e1c4bf874e0851
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/clear-site-data/support/get-resource-to-cache.py
@@ -0,0 +1,14 @@
+# A support server that returns a resource to be cached for one year.
+#
+# However, if the request contains the "Cache-Control: only-if-cached;" header,
+# the server returns status code 500, since such a request should never have
+# reached it.
+def main(request, response):
+  if ("Cache-Control" in request._headers and
+      request._headers["Cache-Control"] == "only-if-cached"):
+    response.status = 500  # Internal server error.
+    return
+
+  return ([("Content-Type", "text/plain"),
+           ("Cache-Control", "max-age=31536000")],
+          "Resource to be cached for 365 days.")