Beginning work on GN build

build/config/chrome_build.gni

Index: build/config/chrome_build.gni
diff --git a/build/config/chrome_build.gni b/build/config/chrome_build.gni
new file mode 100644
index 0000000000000000000000000000000000000000..de6c2c5ff468c1afad70d9289dd09ac1ef9005a7
--- /dev/null
+++ b/build/config/chrome_build.gni
@@ -0,0 +1,27 @@
+# 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.
+
+declare_args() {
+  # Selects the desired build flavor. Official builds get additional
+  # processing to prepare for release. Normally you will want to develop and
+  # test with this flag off.
+  is_official_build = false
+
+  # Select the desired branding flavor. False means normal Chromium branding,
+  # true means official Google Chrome branding (requires extra Google-internal
+  # resources).
+  is_chrome_branded = false
+
+  # Break chrome.dll into multple pieces based on process type. Only available
+  # on Windows.
+  is_multi_dll_chrome = is_win && !is_component_build
+}
+
+# Refers to the subdirectory for branding in various places including
+# chrome/app/theme.
+if (is_chrome_branded) {
+  branding_path_component = "google_chrome"
+} else {
+  branding_path_component = "chromium"
+}