emulator: opengl: ut_renderer usability improvements

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
2 files changed