Trying to re-land r17758

chrome/installer/setup/setup_util.cc

Index: chrome/installer/setup/setup_util.cc
diff --git a/chrome/installer/setup/setup_util.cc b/chrome/installer/setup/setup_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7356ecffa329cefe4f9d5e37a7c7b04a4434e56a
--- /dev/null
+++ b/chrome/installer/setup/setup_util.cc
@@ -0,0 +1,36 @@
+// Copyright (c) 2009 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.
+//
+// This file declares util functions for setup project.
+
+#include "chrome/installer/setup/setup_util.h"
+
+#include "base/file_util.h"
+#include "base/logging.h"
+
+installer::Version* setup_util::GetVersionFromDir(
+    const std::wstring& chrome_path) {
+  LOG(INFO) << "Looking for Chrome version folder under " << chrome_path;
+  std::wstring root_path(chrome_path);
+  file_util::AppendToPath(&root_path, L"*");
+
+  WIN32_FIND_DATA find_data;
+  HANDLE file_handle = FindFirstFile(root_path.c_str(), &find_data);
+  BOOL ret = TRUE;
+  installer::Version *version = NULL;
+  // Here we are assuming that the installer we have is really valid so there
+  // can not be two version directories. We exit as soon as we find a valid
+  // version directory.
+  while (ret) {
+    if (find_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+      LOG(INFO) << "directory found: " << find_data.cFileName;
+      version = installer::Version::GetVersionFromString(find_data.cFileName);
+      if (version) break;
+    }
+    ret = FindNextFile(file_handle, &find_data);
+  }
+  FindClose(file_handle);
+
+  return version;
+}