Update from https://crrev.com/320931

gpu/command_buffer/service/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")
 import("//third_party/protobuf/proto_library.gni")
 
 source_set("service") {
   sources = [
     "async_pixel_transfer_delegate.cc",
@@ skipping 101 matching lines @@
     "transfer_buffer_manager.cc",
     "transfer_buffer_manager.h",
     "valuebuffer_manager.cc",
     "valuebuffer_manager.h",
     "vertex_array_manager.cc",
     "vertex_array_manager.h",
     "vertex_attrib_manager.cc",
     "vertex_attrib_manager.h",
   ]
 
-  defines = [ "GPU_IMPLEMENTATION" ]
-
-  configs += [ "//third_party/khronos:khronos_headers" ]
+  configs += [
+    "//gpu:gpu_implementation",
+    "//third_party/khronos:khronos_headers",
+  ]
 
   # Prefer mesa GL headers to system headers, which cause problems on Win.
   include_dirs = [ "//third_party/mesa/src/include" ]
 
   public_deps = [
     "//gpu/command_buffer/common",
   ]
   deps = [
     ":disk_cache_proto",
     "//base",
@@ skipping 24 matching lines @@
     configs -= [ "//build/config/compiler:optimize" ]
     configs += [ "//build/config/compiler:optimize_max" ]
   }
 }
 
 proto_library("disk_cache_proto") {
   sources = [
     "disk_cache_proto.proto",
   ]
 }