Introduct git-auto-svn

This tool can automatically set up the necessary git-svn metadata for our
repos that live in SVN but are mirrored to Chrome.

R=iannucci@chromium.org, tandrii@chromium.org
BUG=418973

Review URL: https://codereview.chromium.org/611253003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@292241 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/git_footers.py b/git_footers.py
index 6e8136b..fe72e18 100755
--- a/git_footers.py
+++ b/git_footers.py
@@ -11,10 +11,12 @@
 
 import git_common as git
 
+
 FOOTER_PATTERN = re.compile(r'^\s*([\w-]+): (.*)$')
 CHROME_COMMIT_POSITION_PATTERN = re.compile(r'^([\w/-]+)@{#(\d+)}$')
 GIT_SVN_ID_PATTERN = re.compile('^([^\s@]+)@(\d+)')
 
+
 def normalize_name(header):
   return '-'.join([ word.title() for word in header.strip().split('-') ])