AppShell support for Mac.

extensions/shell/app/paths_mac.h

+// Copyright 2014 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.
+
+#ifndef EXTENSIONS_SHELL_APP_PATHS_MAC_H_
+#define EXTENSIONS_SHELL_APP_PATHS_MAC_H_
+
+namespace base {
+class FilePath;
+}
+
+namespace extensions {
+
+// Override the framework bundle path.
+void OverrideFrameworkBundlePath();
+
+// Override the helper (child process) path.
+void OverrideChildProcessFilePath();
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_SHELL_APP_PATHS_MAC_H_