Add the project information to each file's header comment.

BUG=None
TEST=None

Change-Id: I362bfbf18c42025a0248714aa5d69ecfaa1daa2b
Reviewed-on: https://gerrit-int.chromium.org/40826
Reviewed-by: Luis Lozano <llozano@chromium.org>
Commit-Queue: Yuheng Long <yuhenglong@google.com>
Tested-by: Yuheng Long <yuhenglong@google.com>
diff --git a/bestflags/generation_test.py b/bestflags/generation_test.py
index d97f51b..b977925 100644
--- a/bestflags/generation_test.py
+++ b/bestflags/generation_test.py
@@ -1,4 +1,7 @@
-"""Generation unittest."""
+"""Generation unittest.
+
+Part of the Chrome build flags optimization.
+"""
 
 __author__ = 'yuhenglong@google.com (Yuheng Long)'