[autotest] add platform_DebugDaemonTracePath

Exercises debugd TracePath API.

BUG=chromium-os:23839
TEST=Yes

Change-Id: Ia504e3f795f9f6af6de0997e231ef74119e460b2
Signed-off-by: Elly Jones <ellyjones@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/13181
Reviewed-by: Kees Cook <keescook@chromium.org>
2 files changed