Update from https://crrev.com/304121

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/ui.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
@@ skipping 186 matching lines @@
       "$gl_binding_output_dir/gl_bindings_autogen_wgl.h",
     ]
 
     libs = [ "dwmapi.lib" ]
     ldflags = [ "/DELAYLOAD:dwmapi.dll" ]
   }
   if (is_mac) {
     sources += [
       "gl_context_cgl.cc",
       "gl_context_cgl.h",
+      "gl_fence_apple.cc",
+      "gl_fence_apple.h",
       "gl_image_io_surface.cc",
       "gl_image_io_surface.h",
       "scoped_cgl.cc",
       "scoped_cgl.h",
     ]
 
     libs = [
       "IOSurface.framework",
       "OpenGL.framework",
     ]
@@ skipping 121 matching lines @@
 
   generate_jni("gl_jni_headers") {
     deps = [ ":surface_jni_headers" ]
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     jni_package = "ui/gl"
   }
 }