Add ThreadChecker for Ozone X11 GPU.

Ensure Ozone X11 tests the same thread constraints we have in Ozone GBM.

BUG=none

Review-Url: https://codereview.chromium.org/2366643002
Cr-Commit-Position: refs/heads/master@{#421817}
X11SurfaceFactory::X11SurfaceFactory() {
  glx_implementation_.reset(new GLOzoneGLX());
  egl_implementation_.reset(new GLOzoneEGLX11());
}

X11SurfaceFactory::X11SurfaceFactory() {
  glx_implementation_.reset(new GLOzoneGLX());
  egl_implementation_.reset(new GLOzoneEGLX11());
}
