Added FPL_BASE_BACKEND_SDL guard for new utility functions.
Added FPL_BASE_BACKEND_SDL guard for new utility functions.

Bug: 28372680
Change-Id: I80e2d4e595e316e0ed1ead0a889b0cca67b591d1

google/fplbase,google/fplbase,google/fplbase,google/fplbase