Fix cros_debug boot arg missing in test images

bin/cros_make_image_bootable should be called with argument
--force_developer_mode for test and dev images so it has the
correct boot args (cros_debug is included).

BUG=chromium-os:18434
TEST=Run tests and check the output chromium_test_image.bin.
When booted it should include 'cros_debug' in the kernel
commandline.

Change-Id: I52b0c93f655b61b9c49bb1a8128b9f6a632a2f99
Reviewed-on: http://gerrit.chromium.org/gerrit/5021
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Arkaitz Ruiz Alvarez <arkaitzr@chromium.org>
1 file changed