Add a little script for resurrecting pre-fork Blink files

Add a little script for resurrecting pre-fork Blink files

Since Sky is checked directly into mojo and does not contain
Blink history, I knew of no easy way to resurrect Blink files.

In making the V8 debugger work, I had to bring back a ton
of files and thus wrote a script to help me do so.

Maybe others will find this useful.

R=ojan@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/42eabdf4f448b0ca4d2dd03e3d8d6eb9809a9f8e

[ojan, 2014-11-17 19:05:35]

ojan@chromium.org changed reviewers:
+ ojan@chromium.org

[ojan, 2014-11-17 19:05:35]

lgtm

[eseidel, 2014-11-17 19:08:53]

Committed patchset #1 (id:1) manually as
42eabdf4f448b0ca4d2dd03e3d8d6eb9809a9f8e (presubmit successful).