It should be possible to try recipe changes on more than the initial repository you're affecting. For example, if you have a change to depot_tools, you should be able to see how this would affect build, and eventually chromium.
The interface would be the following. You pass in a list of Rietveld issue numbers, and the tool downloads your patches, applies them to the projects you care about, and then runs the tests on all affected repos, reporting any errors in any of the repositories.
I've started work on this; I'm waiting for code review for a couple patches to the bot_update module, but once those land I should be able to get something running.
Comment 1 by bugdroid1@chromium.org
, Mar 16 2016