chrome_chromeos_lkgm: Set ready flag on LKGM CL creation

The CL needs to be set as ready to be submitted after passing CQ.

Also this CL adds the gardeners as a reviewer. This was the previous
behavior and is mentioned in the gardeners handbook.

BUG=b/232822787
TEST=run `chrome_chromeos_lkgm_unittest`

Change-Id: I7ac3daf3a4fd3940aa3997760b83d0e43a76dc32
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3908934
Auto-Submit: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Jack Neus <jackneus@google.com>
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Tested-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
diff --git a/scripts/chrome_chromeos_lkgm_unittest.py b/scripts/chrome_chromeos_lkgm_unittest.py
index 1bf8589..ec71476 100644
--- a/scripts/chrome_chromeos_lkgm_unittest.py
+++ b/scripts/chrome_chromeos_lkgm_unittest.py
@@ -67,6 +67,10 @@
                             123456,
                             labels={"Bot-Commit": 1, "Commit-Queue": 2},
                             notify="NONE",
+                            ready=True,
+                            reviewers=[
+                                "chrome-os-gardeners-reviews@google.com"
+                            ],
                         )
 
     @mock.patch("chromite.lib.gob_util.GetFileContents")
@@ -138,6 +142,10 @@
                             123456,
                             labels={"Bot-Commit": 1, "Commit-Queue": 2},
                             notify="NONE",
+                            ready=True,
+                            reviewers=[
+                                "chrome-os-gardeners-reviews@google.com"
+                            ],
                         )
 
     def testCommitMsg(self):