This change extends MDP composition to support upto 4 layers by making border fill as base pipe and using all MDP h/w pipes in overlay mode. Conflicts: libhwcomposer/hwc.cpp libhwcomposer/hwc_utils.cpp libhwcomposer/hwc_utils.h Bug: 7626586 Change-Id: I01a0e53ddfbcf3ed46734f6f3bb0ef7d912ceac6 Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org> Signed-off-by: Iliyan Malchev <malchev@google.com>