Shell PATH was growing quite long in some cases.
R=gab@chromium.org, iannucci@chromium.org, johnw@chromium.org, maruel@chromium.org
Review URL: https://codereview.chromium.org/180303003
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@253347 0039d316-1c4b-4281-b951-d872f2087c98
This automatically searches the path for a source root (or takes one from the
command line), and then executes the current platform's GN binary inside that
source tree.
This will allow the user to have a "gn" command on their path, and allow our
scripts to run GN without having to bake-in the logic for finding the correct
platform's GN binary.
Review URL: https://codereview.chromium.org/66013002
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@233983 0039d316-1c4b-4281-b951-d872f2087c98
scottmg@chromium.org
brettw@chromium.org