i.e. if you 

git cl format -- bar/foo.cc

bar/foo.cc:

#include "arc/a.h"
#include "base/foo.h"
#include "baz/b.h"

it will correctly move foo.h to the top but without an empty line:

Actual:
#include "bar/foo.h"
#include "arc/a.h"
#include "baz/b.h"

Expected:
#include "bar/foo.h"

#include "arc/a.h"
#include "baz/b.h"

Concrete example @ https://codereview.chromium.org/2876013002/diff/60001/chrome/browser/chromeos/input_method/textinput_test_helper.cc

The codebase already has code that landed with that incorrect formatting.