For the immediate milestone, exclude History and Thumbnails from being backed...

base/mac_util.h

 // Copyright (c) 2008-2009 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.
 
 #ifndef BASE_MAC_UTIL_H_
 #define BASE_MAC_UTIL_H_
 
 #include <Carbon/Carbon.h>
 #include <string>
 #include <vector>
@@ skipping 71 matching lines @@
 void GrabWindowSnapshot(NSWindow* window,
                         std::vector<unsigned char>* png_representation);
 
 // Takes a path to an (executable) binary and tries to provide the path to an
 // application bundle containing it. It takes the outermost bundle that it can
 // find (so for "/Foo/Bar.app/.../Baz.app/..." it produces "/Foo/Bar.app").
 //   |exec_name| - path to the binary
 //   returns - path to the application bundle, or empty on error
 FilePath GetAppBundlePath(const FilePath& exec_name);
 
+// Set the Time Machine exclusion property for the given file.
+bool SetFileBackupExclusion(const FilePath& file_path, bool exclude);
+
 }  // namespace mac_util
 
 #endif  // BASE_MAC_UTIL_H_