Mass change dependency tree for bug 1279002 into a whiteboard keyword.

Would a Rust implementation with a C compatible API work here?

I'd like to see great static-analysis support for the C++ API, and type-safety for params. I.e., I'd like it to be easy for a C++ caller to pass in an int, double, nsAString, nsACString, "foopy". I'm curious if that'd be possible in C. In Rust, I don't know either, haven't looked deeply. I'd not be surprised if the Rust API was a macro, for example. If we're marshalling from the API to the implementation, either rust or js are probably fine, and should be evaluated in their own right. Long story short, we should create the best API possible for C++, and not something that's just the most narrow shim to another programming language.