Proto checkdeps added ignoring partial paths.

Previous attempt to write a proto dependency checker is updated so that partial paths are ignrored for now. This will be changed when Chromium source is updated so that all paths are complete paths.
Next step is marked in http://crbug.com/691451.

BUG=684383
R=brettw@chromium.org

Committed: 4ca3556cb7098968142bb18f9eb0d1ea40c327f0

patch from issue 2653023004 at patchset 20001 (http://crrev.com/2653023004#ps20001)

Patch from Ramin Halavati <rhalavati@chromium.org>.

Review-Url: https://codereview.chromium.org/2691943002 .
3 files changed