The first approach crrev.com/132446 was reverted due to
Windows build breaks. This approach is more robust because
it actually tests the binary by running the command actually.

BUG=114483
TEST=succeeded on Linux

Review URL: http://codereview.chromium.org/10103024

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@132783 0039d316-1c4b-4281-b951-d872f2087c98