Enable OBU_FRAME by default

This experiment is now provisionally adopted.

Change-Id: I5a85f238eacd1dda82a89f76255ce75e2869144b
diff --git a/build/cmake/aom_config_defaults.cmake b/build/cmake/aom_config_defaults.cmake
index 6d38f5e..8cceb67 100644
--- a/build/cmake/aom_config_defaults.cmake
+++ b/build/cmake/aom_config_defaults.cmake
@@ -114,7 +114,7 @@
 set(CONFIG_MAX_TILE 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_MONO_VIDEO 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_NO_FRAME_CONTEXT_SIGNALING 1 CACHE NUMBER "AV1 experiment flag.")
-set(CONFIG_OBU_FRAME 0 CACHE NUMBER "AV1 experiment flag.")
+set(CONFIG_OBU_FRAME 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_OBU_NO_IVF 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_OBU_SIZE_AFTER_HEADER 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_OBU_SIZING 1 CACHE NUMBER "AV1 experiment flag.")