Summary: codereview.chromium.org does not seem to support multi-login

I had to sign in again today in the browser.  I use multi-login with two accounts: my google.com and my chromium.org account.  When I got to codereview.chromium.org, it automatically signed me in with my google.com account instead of my chromium.org account.  There is no UI to switch accounts like there is on crbug.com.

The google.com account is the default account in the gaia cookie and I cannot change this.  This used to work.

Actual:
1/ Go to https://codereview.chromium.org/
2/ Click sign in button at top right.
You are now signed in to the default gaia account.

Expected:
1/ Go to https://codereview.chromium.org/
2/ Click sign in button at top right.
3/ See gaia account switcher.
4/ Click on desired account.
You are now signed in to the desired gaia account.