headless: Add generated version header

headless/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/chrome_build.gni")
 import("//headless/headless.gni")
+import("//build/util/process_version.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 config("headless_implementation") {
   defines = [ "HEADLESS_IMPLEMENTATION" ]
 
   if (headless_use_embedded_resources) {
     defines += [ "HEADLESS_USE_EMBEDDED_RESOURCES" ]
@@ skipping 249 matching lines @@
       "lib/browser/headless_screen.h",
       "lib/browser/headless_window_parenting_client.cc",
       "lib/browser/headless_window_parenting_client.h",
       "lib/browser/headless_window_tree_host.cc",
       "lib/browser/headless_window_tree_host.h",
     ]
   }
 
   deps = [
     ":gen_devtools_client_api",
+    ":version_header",
     "//base",
     "//components/security_state/content",
     "//components/security_state/core",
     "//content/public/app:both",
     "//content/public/browser",
     "//content/public/common",
     "//content/public/common:service_names",
     "//net",
     "//services/service_manager/public/cpp",
     "//third_party/mesa:osmesa",
@@ skipping 155 matching lines @@
   sources = [
     "app/headless_shell_main.cc",
   ]
 
   deps = [
     "//headless:headless_shell_lib",
   ]
 
   configs += [ ":headless_implementation" ]
 }
+
+process_version("version_header") {
+  template_file = "public/version.h.in"
+  sources = [
+    "//build/util/LASTCHANGE",
+    "//chrome/VERSION",
+  ]
+  output = "$target_gen_dir/public/version.h"
+}