Change clang_format.py to search for clang-format in buildtools

gclient_utils.py

Index: gclient_utils.py
diff --git a/gclient_utils.py b/gclient_utils.py
index 655e5aa1b704e9c49dd0d626fe72c191201aa80f..46bea3d3a51a6c923204ab00ab0221742aa489ae 100644
--- a/gclient_utils.py
+++ b/gclient_utils.py
@@ -655,6 +655,8 @@ def GetBuildtoolsPath():
   This is based on the root of the checkout containing the current directory."""
   gclient_root = FindGclientRoot(os.getcwd())
   if not gclient_root:
+    if os.path.exists('buildtools'):
+      return os.path.join(os.getcwd(), 'buildtools')
     return None
   return os.path.join(gclient_root, 'src', 'buildtools')