Replace hard-coded cookie expiration dates in WPT Python files

These cookies are meant to expire in the future (i.e. be valid now), but
by hard-coding the expiration date, they will no longer be valid when
the date expires. This changes the hard-coded expiration dates to a date
guaranteed to be in the future.

Change-Id: Ia0aa5b02483af76d198f09061e6073f538bba8e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2872768
Auto-Submit: Lily Chen <[email protected]>
Reviewed-by: Aaron Tagliaboschi <[email protected]>
Commit-Queue: Lily Chen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#879417}

content-security-policy/reporting/support/set-cookie.py

@@ -1,3 +1,5 @@
+from datetime import date
+
 def main(request, response):
     """
     Returns cookie name and path from query params in a Set-Cookie header.
@@ -11,15 +13,16 @@ def main(request, response):
     >
     < HTTP/1.1 200 OK
     < Content-Type: application/json
-    < Set-Cookie: match-slash=1; Path=/; Expires=Wed, 09 Jun 2021 10:18:14 GMT
+    < Set-Cookie: match-slash=1; Path=/; Expires=09 Jun 2021 10:18:14 GMT
     < Server: BaseHTTP/0.3 Python/2.7.12
     < Date: Tue, 04 Oct 2016 18:16:06 GMT
     < Content-Length: 80
     """
 
     name = request.GET[b'name']
     path = request.GET[b'path']
-    cookie = b"%s=1; Path=%s; Expires=Wed, 09 Jun 2021 10:18:14 GMT" % (name, path)
+    expiry_year = date.today().year + 1
+    cookie = b"%s=1; Path=%s; Expires=09 Jun %d 10:18:14 GMT" % (name, path, expiry_year)
 
     headers = [
         (b"Content-Type", b"application/json"),

cookies/resources/set-cookie.py

@@ -1,3 +1,5 @@
+from datetime import date
+
 def main(request, response):
     """
     Returns cookie name and path from query params in a Set-Cookie header.
@@ -11,15 +13,16 @@ def main(request, response):
     >
     < HTTP/1.1 200 OK
     < Content-Type: application/json
-    < Set-Cookie: match-slash=1; Path=/; Expires=Wed, 09 Jun 2021 10:18:14 GMT
+    < Set-Cookie: match-slash=1; Path=/; Expires=09 Jun 2021 10:18:14 GMT
     < Server: BaseHTTP/0.3 Python/2.7.12
     < Date: Tue, 04 Oct 2016 18:16:06 GMT
     < Content-Length: 80
     """
 
     name = request.GET[b'name']
     path = request.GET[b'path']
-    cookie = b"%s=1; Path=%s; Expires=Wed, 09 Jun 2021 10:18:14 GMT" % (name, path)
+    expiry_year = date.today().year + 1
+    cookie = b"%s=1; Path=%s; Expires=09 Jun %d 10:18:14 GMT" % (name, path, expiry_year)
 
     headers = [
         (b"Content-Type", b"application/json"),