ui: Add libsync GLFence implementation.

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/buildflag_header.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//ui/ozone/ozone.gni")
 import("//testing/test.gni")
@@ skipping 156 matching lines @@
       "gl_fence_egl.cc",
       "gl_fence_egl.h",
       "gl_image_egl.cc",
       "gl_image_egl.h",
       "gl_surface_egl.cc",
       "gl_surface_egl.h",
     ]
   }
   if (is_android || is_linux) {
     sources += [
+      "gl_fence_libsync.cc",
+      "gl_fence_libsync.h",
       "gl_implementation_osmesa.cc",
       "gl_implementation_osmesa.h",
     ]
+    deps += [ "//third_party/libsync" ]
   }
   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",
     ]
@@ skipping 226 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"
   }
 }