Componentize VersionInfo.

components/version_info/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("//chrome/version.gni")
+
+if (is_ios) {
+  declare_args() {
+    # Path to the file used to override the version PATH level on iOS.
+    # Default to ios/build/util/VERSION.
+    ios_extra_version_path = "//ios/build/util/VERSION"
+
+    # Controls whether the extra version path should be overridden to
+    # use ios/build/util/CANARY_VERSION (legacy until the bots have
+    # been updated to override ios_extra_version_path instead).
+    # TODO(sdefresne): remove once http://crbug.com/514560 is fixed.
+    use_canary_version_file = false
+  }
+}
+
+source_set("version_info") {
+  sources = [
+    "version_info.cc",
+    "version_info.h",
+  ]
+
+  deps = [
+    "//base",
+    "//components/strings",
+    "//ui/base",
+    ":generate_version_info",
+  ]
+}
+
+process_version("generate_version_info") {
+  visibility = [ ":version_info" ]
+  template_file = "version_info_values.h.version"
+  output = "$target_gen_dir/version_info_values.h"
+
+  if (is_ios) {
+    if (use_canary_version_file) {
+      extra_version_path = "//ios/build/util/CANARY_VERSION"
+    } else {
+      extra_version_path = ios_extra_version_path
+    }
+
+    # iOS overrides PATCH level of the version with the value from the file
+    # named by ios_version_path, however, this needs to be the last argument
+    # to the version.py script, so it cannot be added to the source variable
+    # and instead need to be managed manually.
+
+    inputs += [ extra_version_path ]
+    extra_args = [
+      "-f",
+      rebase_path(extra_version_path, root_build_dir),
+    ]
+  }
+}