Implement GLX for Ozone X11.

ui/gl/gl_implementation.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gl_implementation.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 40 matching lines @@
     delete g_libraries;
     g_libraries = NULL;
   }
 }
 
 }  // namespace
 
 base::ThreadLocalPointer<GLApi>* g_current_gl_context_tls = NULL;
 OSMESAApi* g_current_osmesa_context;
 
+#if defined(USE_EGL)
+EGLApi* g_current_egl_context;
+#endif
+
 #if defined(OS_WIN)
+WGLApi* g_current_wgl_context;
+#endif
 
-EGLApi* g_current_egl_context;
-WGLApi* g_current_wgl_context;
-
-#elif defined(USE_X11)
-
-EGLApi* g_current_egl_context;
+#if defined(USE_GLX)
 GLXApi* g_current_glx_context;
-
-#elif defined(USE_OZONE)
-
-EGLApi* g_current_egl_context;
-
-#elif defined(OS_ANDROID)
-
-EGLApi* g_current_egl_context;
-
 #endif
 
 GLImplementation GetNamedGLImplementation(const std::string& name) {
   for (size_t i = 0; i < arraysize(kGLImplementationNamePairs); ++i) {
     if (name == kGLImplementationNamePairs[i].name)
       return kGLImplementationNamePairs[i].implementation;
   }
 
   return kGLImplementationNone;
 }
@@ skipping 124 matching lines @@
   const char* version_str =
       reinterpret_cast<const char*>(glGetString(GL_VERSION));
   unsigned major_version, minor_version;
   bool is_es, is_es3;
   gfx::GLVersionInfo::ParseVersionString(
       version_str, &major_version, &minor_version, &is_es, &is_es3);
   return is_es || major_version < 3;
 }
 
 }  // namespace gfx