libvideorender: CB1 weston can't receive event [1/1]

PD#TV-124479

Problem:
set keep last frame before render lib disconnect,
weston can't receive keep last frame flag when weston is
doing other things,than render lib disconnect from weston,
weston signal socket hangup,so weston lost some events

Solution:
1.set keep last frame flag after sent first video frame

Verify:
ap222

Change-Id: I0763aaa9d4d26a47592167c99432363867a41ba7
Signed-off-by: fei.deng <fei.deng@amlogic.com>
3 files changed