If there is any video layer below the HWC_SKIP_LAYER, we compose that video layer using the GPU. Unlock any previous video buffer that were sent to the overlay. CRs-fixed: 333974 Change-Id: I1937ca8b139f40453a3bccb0b490fd4d65fa1f52 (cherry picked from commit 48a3996a2178244ce6365f97212c55e7ab33752a) (cherry picked from commit f4a08165b2d3be97b72287fc4001cb5c90d57c07)