Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/build/inverse_depth.py b/build/inverse_depth.py
new file mode 100755
index 0000000..ce7a6ab
--- /dev/null
+++ b/build/inverse_depth.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+# 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.
+
+import os
+import sys
+
+
+def DoMain(argv):
+  depth = argv[0]
+  return os.path.relpath(os.getcwd(), os.path.abspath(depth))
+
+
+def main(argv):
+  if len(argv) < 2:
+    print "USAGE: inverse_depth.py depth"
+    return 1
+  print DoMain(argv[1:])
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))