Add GN build for parts of gpu and ozone.

gpu/command_buffer/BUILD.gn

Index: gpu/command_buffer/BUILD.gn
diff --git a/gpu/command_buffer/BUILD.gn b/gpu/command_buffer/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..c37e90fef356e4d8ae498b0f352520fcd08bcedd
--- /dev/null
+++ b/gpu/command_buffer/BUILD.gn
@@ -0,0 +1,17 @@
+# 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.
+
+component("gles2_utils") {
+  sources = [
+    "common/gles2_cmd_format.h",
+    "common/gles2_cmd_utils.cc",
+    "common/gles2_cmd_utils.h",
+    "common/gles2_utils_export.h",
+  ]
+
+  defines = [ "GLES2_UTILS_IMPLEMENTATION" ]
+  all_dependent_configs = [ "//third_party/khronos:khronos_headers" ]
+  deps = [ "//base" ]
+}
+