This patch provides two useful changes to the ut_renderer
unit-test program:
1/ the ability to control the GL window dimensions with
two env. variables: ANDROID_WINDOW_WIDTH and ANDROID_WINDOW_HEIGHT
2/ the ability to save/restore the GL window position between
GL connections.
Both are useful to use ut_renderer in a demo setting, nothing more.
Change-Id: I19a8f911ee821ddc4eb6307de12d63600ff696b0