Added OpenGL includes for tests that directly include OpenGL.

Some tests that used OpenGL classes did not include OpenGL headers.
This worked by coincidence on systems where gl.h was in system path.
Didn't work on the Mac.

Change-Id: If13ef3605b239ddf8d345b82d374841e50d30601
Merge topic 'osmesa-mac-compile-errors' into master

19611a36 Added OpenGL includes for tests that directly include OpenGL.