For example, platform2/lorgnette/manager.h has:

#include <metrics/metrics_library.h>

Due to include path order, the above #include reads a file at $HOME/trunk/src/platform2/metrics/metrics_library.h, not at /build/$BOARD/usr/include/metrics/metrics_library.h.

This usually makes no difference, but it makes troubles if we enforce sandbox to CROS_WORKON_SUBTREE as proposed in Issue 791888.