(ImageLoader) Added synchronous method to get closest image size

(ImageLoader) Added synchronous method to get closest image size

[Issue#]       N/A
[Problem]      Can't synchronously determine what the loaded image size will be
[Cause]        Not implemented
[Solution]     Added a new method to the platform abstraction to get the closest
size for a given requested size and orientation correction.
Changed image implementation to set the correct image size on creation.

Change-Id: I7dab185ecc18e6f8605a3c3996d6586c47e5fb6e
[Verification] Build Repo
Signed-off-by: David Steele <david.steele@partner.samsung.com>