Store each file as "hash/<sha1>", list of hashes as "meta/@<rev>" and serve them at "serve_file/@<rev>/<file-path>".

BUG=459167
R=mnaganov@chromium.org

Review URL: https://codereview.chromium.org/954693002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/chrome-devtools-frontend@294235 0039d316-1c4b-4281-b951-d872f2087c98