gn: Generalize process_version() and move it to build/util

build/config/chrome_build.gni

 # 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() {
   # 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"
 }
+
+# The path to the BRANDING file in chrome/app/theme.
+branding_file_path = "//chrome/app/theme/$branding_path_component/BRANDING"

[brettw, 2016/09/13 17:59:15]

Can you move this to the chrome process_versoin.gni file? There's one place in
compoents that needs this also, but a layering violation from components to
chrome on branding seems less bad than one from build (since build is shared
with other projects).