Code:  X11SurfaceFactory::GetAllowedGLImplementations() {
   std::vector<gl::GLImplementation> impls;
   impls.push_back(gl::kGLImplementationEGLGLES2);
  impls.push_back(gl::kGLImplementationDesktopGL);
  impls.push_back(gl::kGLImplementationOSMesaGL);
  return impls;
 }

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}