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/task.py b/bestflags/task.py
index b092ffc..f5908fd 100644
--- a/bestflags/task.py
+++ b/bestflags/task.py
@@ -1,5 +1,7 @@
 """A reproducing entity.
 
+Part of the Chrome build flags optimization.
+
 The Task class is used by different modules. Each module fills in the
 corresponding information into a Task instance. Class Task contains the bit set
 representing the flags selection. The builder module is responsible for filling