This was submitted as https://codereview.chromium.org/2710673004/.

The content of the strangely deleted comment:

Comment #1 on  issue 696012  by bugdroid1@chromium.org: Allow experiment bitsets of any size.
https://bugs.chromium.org/p/chromium/issues/detail?id=696012#c1

The following revision refers to this bug:
https://chromium.googlesource.com/chromium/src.git/+/b5a09c31d9b7af63c2b82194200bbb3ed9c5a878

commit b5a09c31d9b7af63c2b82194200bbb3ed9c5a878
Author: twifkak <twifkak@chromium.org>
Date: Fri Feb 24 21:18:18 2017

precache: Allow experiment bitsets of any size.

Add bytes-typed field to PrecacheResourceSelection, which allows for an
arbitrarily-sized bit vector, and thus doesn't limit the number of
resources per site to 64.

BUG= 696012 

Review-Url: https://codereview.chromium.org/2710673004
Cr-Commit-Position: refs/heads/master@{#452921}

[modify] https://crrev.com/b5a09c31d9b7af63c2b82194200bbb3ed9c5a878/components/precache/core/precache_fetcher.cc
[modify] https://crrev.com/b5a09c31d9b7af63c2b82194200bbb3ed9c5a878/components/precache/core/precache_fetcher_unittest.cc
[modify] https://crrev.com/b5a09c31d9b7af63c2b82194200bbb3ed9c5a878/components/precache/core/proto/precache.proto