Force Python LF checkout in .gitattributes.

This will fix Windows python license check presubmit errors. It
will ensure the presubmit check always sees "LF" line ending.

BUG=669941

Review-Url: https://codereview.chromium.org/2558413002
Cr-Commit-Position: refs/heads/master@{#437871}

.gitattributes

-## This page intentionally left blank. ##
-#
-# Workaround for VS2013 automatically creating .gitattributes files with
-# default settings that we don't want.
-# See also:
-# http://connect.microsoft.com/VisualStudio/feedback/details/804948/inappropriately-creates-gitattributes-file
-# http://crbug.com/342064
+# Stop Windows python license check presubmit errors by forcing LF checkout.
+*.py  text eol=lf

OWNERS

@@ -4,6 +4,7 @@ cpu@chromium.org
 darin@chromium.org
 jam@chromium.org
 
+per-file .gitattributes=*
 per-file .gitignore=*
 per-file .git-blame-ignore-revs=mgiuca@chromium.org
 per-file .git-blame-ignore-revs=thakis@chromium.org