During generation of the version.cc file, read the current Git hash.

runtime/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # TODO(zra): These build arguments should likely be moved to a gni file that is
 # included in BUILD.gn files that care about the values of the flags. For now,
 # since the GN build only happens as part of a Mojo build there is no need for
 # the indirection.
 declare_args() {
   # Instead of using is_debug, we introduce a different flag for specifying a
@@ skipping 187 matching lines @@
     "vm/version_in.cc",
   ]
   output = "$target_gen_dir/version.cc"
   outputs = [ output, ]
 
   script = "../tools/make_version.py"
   args = [
     "--quiet",
     "--output", rebase_path(output, root_build_dir),
     "--input", rebase_path("vm/version_in.cc", root_build_dir),
-    "--ignore_svn_revision",
   ]
 }
 
 
 executable("libdart_dependency_helper") {
   configs += [":dart_config",
               ":dart_product_config",
               ":dart_precompiled_runtime_config"]
   deps = [
     "vm:libdart_lib_nosnapshot",
     "vm:libdart_lib",
     "vm:libdart_vm",
     "vm:libdart_platform",
     "third_party/double-conversion/src:libdouble_conversion",
   ]
   sources = [
     "vm/libdart_dependency_helper.cc",
   ]
 }