The doc currently references the SVN repo, which is outdated by a fair bit. 

I also cannot sensibly parse this section:
--- cut here ---
If the code is applicable and will be compiled on all supported Chromium
platforms (Windows, Mac, Linux, Chrome OS, iOS, Android), check it in to
[src/third_party](http://src.chromium.org/viewvc/chrome/trunk/src/third_party/).

If the code is only applicable to certain platforms, check it in to
[src/third_party](http://src.chromium.org/viewvc/chrome/trunk/src/third_party/)
and add an entry to the
[DEPS](http://src.chromium.org/viewvc/chrome/trunk/src/DEPS) file that causes
the code to be checked out from src/third_party into src/third_party by gclient.
-- cut here ---

if all, put in location X, otherwise put in locationX?