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

chrome/process_version_rc_template.gni

Index: chrome/process_version_rc_template.gni
diff --git a/chrome/process_version_rc_template.gni b/chrome/process_version_rc_template.gni
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index 0000000000000000000000000000000000000000..9259ac135736079e7dc8a5922fa039555d3e1ced
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+++ b/chrome/process_version_rc_template.gni
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+# Copyright 2016 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/chrome_build.gni")
+import("//build/util/process_version.gni")
+
+# The path to the BRANDING file in chrome/app/theme.
+branding_file_path = "//chrome/app/theme/$branding_path_component/BRANDING"
+
+# This is a wrapper around process_version() that eases the task of processing
+# a .rc.version file (used especially on Windows).
+#
+# This template automatically includes VERSION, LASTCHANGE and BRANDING, and
+# any additional source files are passed after those (so their values can
+# override the ones specified by those 3 files).
+#
+# Parameters:
+#   sources (optional):
+#     List of files with value definitions that will be passed in addition to
+#     VERSION, LASTCHANGE and BRANDING.
+#
+#   template_file (optional):
+#     Template file to use (not a list). If not specified, a default value,
+#     //chrome/app/chrome_version.rc.version will be used.
+#
+# This template forwards all other parameters directly to process_version().
+#
+# Examples:
+#   process_version_rc_template("my_exe_version") {
+#     output = "$target_gen_dir/my_exe_version.rc"
+#     sources = [ "frob/my_exe.ver" ]
+#     extra_args = [ "-e", "FOO=42" ]
+#   }
+#
+#   process_version_rc_template("my_dll_version") {
+#     output = "$target_gen_dir/my_dll_version.rc"
+#     template_file = [ "//foo/bar/my_dll_version.rc.version" ]
+#   }
+template("process_version_rc_template") {
+  if (defined(invoker.template_file)) {
+    _template_file = invoker.template_file
+  } else {
+    _template_file = "//chrome/app/chrome_version.rc.version"
+  }
+  _sources = [
+    "//build/util/LASTCHANGE",
+    "//chrome/VERSION",
+    branding_file_path,
+  ]
+  if (defined(invoker.sources)) {
+    _sources += invoker.sources
+  }
+
+  process_version(target_name) {
+    template_file = _template_file
+    sources = _sources
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "sources",
+                             "template_file",
+                           ])
+  }
+}