Code:  GLOzone* X11SurfaceFactory::GetGLOzone(gl::GLImplementation implementation) {
   switch (implementation) {
     case gl::kGLImplementationDesktopGL:
       return glx_implementation_.get();
    case gl::kGLImplementationEGLGLES2:
      return egl_implementation_.get();
    default:
      return nullptr;
  }
}

Vulnerability Type: Bypass 
CWE ID: CWE-284
Summary: Google Chrome before 39.0.2171.65 on Android does not prevent navigation to a URL in cases where an intent for the URL lacks CATEGORY_BROWSABLE, which allows remote attackers to bypass intended access restrictions via a crafted web site.
Commit Message: 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}