test-journal: use new _add_frame_callback api
test-journal: use new _add_frame_callback api

This updates test-journal to use the new
cogl_onscreen_add_frame_callback() api to use _SYNC events for
throttling.

djdeath/cogl-android,djdeath/cogl-android,djdeath/cogl,djdeath/cogl,gcampax/cogl,gcampax/cogl,djdeath/cogl,djdeath/cogl-android,gcampax/cogl,gcampax/cogl