Expose a function to get the path to a DLL.

chrome/installer/util/module_util_win.h

+// Copyright (c) 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.
+
+// This file defines a utility function to get the full path of a module.
+
+#ifndef CHROME_INSTALLER_UTIL_MODULE_UTIL_WIN_H_
+#define CHROME_INSTALLER_UTIL_MODULE_UTIL_WIN_H_
+
+#include "base/files/file_path.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
+
+namespace installer {
+
+// Returns the full path to a module named |module_name|, or an empty path if
+// the current module doesn't have a version resource. The searched module must

[grt (UTC plus 2), 2015/10/30 17:45:37]

still not quite right: it's an empty path if there's no version resource and the
desired module isn't in the current directory, right? :-)

[fdoray, 2015/10/30 18:25:25]

Yes, you're right. I hope I got it right this time :)

+// be in the same directory as the current executable, or in a version
+// subdirectory. On output, if the module is in a version subdirectory,
+// |version| is populated with the version of the module.
+base::FilePath GetModulePath(const base::StringPiece16& module_name,
+                             base::string16* version);
+
+}  // namespace installer
+
+#endif  // CHROME_INSTALLER_UTIL_MODULE_UTIL_WIN_H_