Summary:
With EGL_MESA_platform_surfaceless we don't need a dri device anymore.
So we don't need to skip the tests if the device is missing. Instead the
tests verify that OpenGL compositing is used if requested.
Test Plan: ctest passes
Reviewers: #kwin
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D18014
The SceneOpenGLTest is transformed into a GenericSceneOpenGLTest which
can create either an OpenGL or an OpenGL ES scene based on env variable
which it sets in initTestCase. The env variable to set is passed as a
ctor argument from the SceneOpenGLTest and the new SceneOpenGLESTest.
This allows to easily run the same test code for both our OpenGL and
OpenGL ES compositor.
