https://chromium.googlesource.com/chromium/src/+/master/mojo/README.md

Mojoを始める

ChromiumでMojoを使うにはまずMojoとサービスのMojo部分を読むといい。

より詳しい情報を知りたければ、使用している言語の For more detailed reference material on the most commonly used features of Mojo, head directly to the bindings documentation for your language of choice or the more general mojom Interface Definition Language (IDL) documentation.

If you‘re looking for information on creating and/or connecting to services, you’re in the wrong place! Mojo does not deal with services, it only facilitates interface definition, message passing, and other lower-level IPC primitives. Instead, you should take a look at some of the other available Mojo & Services documentation.