Fix several bugs for synchronous sizing + Print more debug logs for it

Fix several bugs for synchronous sizing + Print more debug logs for it

- We don't need to 'ignore' the cached size.
- We don't know last rasterized size at immediate loading time
- We don't need to re-load as desired size when visual is scene-on again.
 -> Actually, It will re-load after OnSetTransform(). But anyway,
    it will return cached texture and don't re-load any images.
- Bug fix if mLoadState become NOT_START but mTextures exist.

TODO : Send ResourceReady at OnRelayout callback is not a good idea.
Shouldn't we re-load at Idle, or PostProcess time?

Change-Id: Ia13a03feaf0f3909c75196472cc865b15a6fca2d
Signed-off-by: Eunki Hong <eunkiki.hong@samsung.com>