Add a simple script to simplify using clang-format from vim.

tools/vim/clang-format.vim

Index: tools/vim/clang-format.vim
diff --git a/tools/vim/clang-format.vim b/tools/vim/clang-format.vim
new file mode 100644
index 0000000000000000000000000000000000000000..ab91f133b558555f1301cdcd7b050cb393416af3
--- /dev/null
+++ b/tools/vim/clang-format.vim
@@ -0,0 +1,21 @@
+" Copyright (c) 2013 The Chromium Authors. All rights reserved.

[scottmg, 2014/01/16 19:42:12]

LIVE IN THE NOW

[Nico, 2014/01/16 19:44:12]

but i was younger back then

+" Use of this source code is governed by a BSD-style license that can be
+" found in the LICENSE file.
+
+" Binds cmd-shift-i (on Mac) or ctrl-shift-i (elsewhere) to invoking
+" clang-format.py.
+" It will format the current selection (and if there's no selection, the
+" current line.)
+
+let s:script = expand('<sfile>:p:h') .
+  \'/../../third_party/clang_format/scripts/clang-format.py'
+echo s:script
+
+if has('mac')
+  execute "map <D-I> :pyf " . s:script . "<CR>"
+  execute "imap <D-I> <ESC>:pyf " . s:script . "<CR>i"
+else
+  execute "map <C-I> :pyf " . s:script . "<CR>"
+  execute "imap <C-I> <ESC>:pyf " . s:script . "<CR>i"
+endif
+