Update from https://crrev.com/320931

gpu/gles2_conform_support/BUILD.gn

+# Copyright 2015 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/allocator.gni")
+
+# GYP version: gpu/gles2_conform_support/gles2_conform_support.gyp:gles2_conform_support
+executable("gles2_conform_support") {
+  sources = [
+    "gles2_conform_support.c",
+    "native/egl_native.cc",
+    "native/egl_native_win.cc",
+    "native/main.cc",
+  ]
+  defines = [
+    "GLES2_CONFORM_SUPPORT_ONLY",
+    "GTF_GLES20",
+    "EGLAPI=",
+    "EGLAPIENTRY=",
+  ]
+  deps = [
+    "//base",
+    "//gpu/gles2_conform_support/egl",
+    "//base/third_party/dynamic_annotations",
+    "//ui/gl",
+    "//gpu/command_buffer/client:gles2_c_lib_nocheck",
+  ]
+  if (is_linux) {
+    sources += [
+      "native/egl_native_aura.cc",
+      "native/egl_native_x11.cc",
+    ]
+  }
+  if (use_allocator != "none") {
+    # See http://crbug.com/162998#c4 for why this is needed.
+    deps += [ "//base/allocator" ]
+  }
+}