libvideorender: CB2 fix frame dropped [1/1]

PD#SWPL-179493

Problem:
1.pause and resume can cause frame dropped.
those frames ready to send to weston in
queue will drop when resume
2.if weston output is null, we can't set
configt on surface, it causes wayland protocol
communicate failure.

Solution:
1.do not pause in weston render plugin.
pause in render lib core.
2.refine display frame when output is null

Verify:
ap222

Change-Id: I32e8c268884e05dc8b2a590a768506afbc2f26fe
Signed-off-by: fei.deng <fei.deng@amlogic.com>
4 files changed