Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/update-nocookie-worker.py

+import time
+
+def main(request, response):
+    # no-cache itself to ensure the user agent finds a new version for each update.
+    headers = [('Cache-Control', 'no-cache, must-revalidate'),
+               ('Pragma', 'no-cache')]
+
+    # Set a normal mimetype.
+    content_type = 'application/javascript'
+
+    headers.append(('Content-Type', content_type))
+    # Return a different script for each access.  Use .time() and .clock() for
+    # best time resolution across different platforms.
+    return headers, '// %s %s' % (time.time(), time.clock())
+