Add chrome_cleaner test resources and scripts to compute digest of empty DLL

R=csharp

Bug: 830892
Change-Id: Ia98a43f14b355ef58582ee610f70f938a7056e64
Reviewed-on: https://chromium-review.googlesource.com/1144259
Commit-Queue: Chris Sharp <csharp@chromium.org>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576624}
6 files changed