Update tooling to use clang-format (issue #2171)

tools/clang_util.py

@@ -0,0 +1,22 @@
+# Copyright (c) 2017 The Chromium Embedded Framework Authors. All rights
+# reserved. Use of this source code is governed by a BSD-style license that
+# can be found in the LICENSE file
+
+from exec_util import exec_cmd
+import sys
+
+if sys.platform == 'win32':
+  # Force use of the clang-format version bundled with depot_tools.
+  clang_format_exe = 'clang-format.bat'
+else:
+  clang_format_exe = 'clang-format'
+
+def clang_format(file_contents):
+  result = exec_cmd(clang_format_exe, ".", file_contents)
+  if result['out'] != '':
+    output = result['out']
+    if sys.platform == 'win32':
+      # Convert to Unix line endings.
+      output = output.replace("\r", "")
+    return output
+  return None