service worker: Add fieldtrial config for eager code cache outside install event

So that we can run the fieldtrial on Beta channel.

Bug: 915081
Change-Id: Id3187467f9ce69fa6d172913b38f4a1499eeb596
Reviewed-on: https://chromium-review.googlesource.com/c/1466210
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631520}
1 file changed