When running an executable fails, the original error message sent by
the OS is printed, together with a more detailed suggested solution.

BUG=

Review URL: https://codereview.chromium.org/245133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@266908 0039d316-1c4b-4281-b951-d872f2087c98