bisect-kit: provide repo link for add_repo action

Make frontend more user-friendly

BUG=None
TEST=None

Change-Id: I2530d4fa89e8b2da8cd5b9c16b459e8948183324
Reviewed-on: https://chromium-review.googlesource.com/1545616
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Chi-Ngai Wan <cnwan@google.com>
diff --git a/bisect_kit/codechange.py b/bisect_kit/codechange.py
index 172544e..80dbc0d 100644
--- a/bisect_kit/codechange.py
+++ b/bisect_kit/codechange.py
@@ -405,6 +405,8 @@
         timestamp=self.timestamp,
         action_type='add_repo',
         path=self.path,
+        repo_url=self.repo_url,
+        rev=self.rev,
         text=text,
     )