Worker: Add "timout long" to shared-worker-import-csp.html

This test occasionally times out. Probably the test just takes longer
time to start up shared workers.

Bug: 1076432
Change-Id: Ib5af99bbf43ff86ba2243665721576af167e2816
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2172602
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Auto-Submit: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#764092}
diff --git a/workers/modules/shared-worker-import-csp.html b/workers/modules/shared-worker-import-csp.html
index b6d8642..c7ca375 100644
--- a/workers/modules/shared-worker-import-csp.html
+++ b/workers/modules/shared-worker-import-csp.html
@@ -1,5 +1,6 @@
 <!DOCTYPE html>
 <title>SharedWorker: CSP for ES Modules</title>
+<meta name="timeout" content="long">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>