Implement GLX for Ozone X11.

ui/gl/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
+import("//ui/ozone/ozone.gni")
 import("//testing/test.gni")
 
 use_egl = is_win || is_android || is_linux
-use_glx = use_x11
+use_glx = use_x11 || ozone_platform_x11
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 config("gl_config") {
   defines = []
   if (use_glx) {
     defines += [
@@ skipping 140 matching lines @@
   if (is_android || is_linux) {
     sources += [
       "gl_implementation_osmesa.cc",
       "gl_implementation_osmesa.h",
     ]
   }
   if (use_x11) {
     sources += [
       "gl_surface_egl_x11.cc",
       "gl_surface_egl_x11.h",
+      "gl_surface_glx_x11.cc",
+      "gl_surface_glx_x11.h",
       "gl_surface_osmesa_x11.cc",
       "gl_surface_osmesa_x11.h",
     ]
 
     data_deps = [
       "//third_party/angle:libEGL",
       "//third_party/angle:libGLESv2",
     ]
   }
   if (use_glx) {
@@ skipping 215 matching lines @@
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     public_deps = [
       ":surface_jni_headers",
     ]
     jni_package = "ui/gl"
   }
 }