Today we have an "extra solution" for the .gclient on some of our bots that's become a dumping ground for everything that we need in addition to a regular checkout for running advanced tests. It contains code for downloading a Go runtime, a precompiled AppRTC, a nightly Firefox build etc.

Originally it was only used for Chromium WebRTC tests, but it has recently started to be used by our Android Perf bots since they also run AppRTC for AppRTCMobile loopback calls. That meant these bots broke when  bug 717500  hit us recently, even if those bots don't even need Firefox.

We should work out a better way to download "special resources" like this. My suggestion is that we invoke a download script manually as a build step on the bots instead of relying on the webrtc.DEPS (https://chromium.googlesource.com/chromium/deps/webrtc/webrtc.DEPS) solution being present. That also means those scripts needs to be moved out of there and into the Chromium/WebRTC repos instead.

In addition to that build step, the tests that needs these things should have a sanity check in place to ensure a user that attempts to run them get a clear error message about what's missing, instead of a hard-to-debug error.