Docserver: Add commit history and _reset_commit servlet

chrome/common/extensions/docs/server2/servlet.py

Index: chrome/common/extensions/docs/server2/servlet.py
diff --git a/chrome/common/extensions/docs/server2/servlet.py b/chrome/common/extensions/docs/server2/servlet.py
index 5465d81b57be10ec9ef898aaad0ab64c97bf5865..61917fffae6c0be93bcfab742c486702e27ccd06 100644
--- a/chrome/common/extensions/docs/server2/servlet.py
+++ b/chrome/common/extensions/docs/server2/servlet.py
@@ -96,6 +96,12 @@ class Response(object):
     return Response(headers={'Location': url}, status=status)
 
   @staticmethod
+  def BadRequest(content, headers=None):
+    '''Returns a bad request (400) response.
+    '''
+    return Response(content=content, headers=headers, status=400)
+
+  @staticmethod
   def NotFound(content, headers=None):
     '''Returns a not found (404) response.
     '''