Port generate_gles2_conform_embedded_files action to GN build.

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")
 import("//testing/test.gni")
 
 # GYP version: gpu/gles2_conform_support/gles2_conform_support.gyp:gles2_conform_support
 executable("gles2_conform_support") {
   sources = [
@@ skipping 20 matching lines @@
       "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" ]
   }
 }
 
+if (internal_gles2_conform_tests) {
+  action("generate_gles2_conform_embedded_files") {
+    script = "generate_gles2_embedded_data.py"
+    output = [
+      "$target_gen_dir/gles2_conform_test_embedded_data/FilesData.c",
+      "$target_gen_dir/gles2_conform_test_embedded_data/FilesData.h",
+      "$target_gen_dir/gles2_conform_test_embedded_data/FilesTOC.c",
+    ]
+    args = [
+      "../../third_party/gles2_conform/GTF_ES/glsl/GTF",
+      "$target_gen_dir/gles2_conform_test_embedded_data",
+    ]
+  }
+}
+
 test("gles2_conform_test") {
   sources = [
     "gles2_conform_test.cc",
   ]
   deps = [
     "//base",
     "//gpu/config",
     "//testing/gtest",
   ]
 }