A partir do Chromium Portable Help.html:
Chromium Portable has a few settings that affect the behavior of the launcher and of the browser. They can be set by creating a file named ChromiumPortable.ini alongside ChromiumPortable.exe.
The ChromiumPortable.ini file is composed of lines in the key=value format. Valid keys are listed below.
GoogleAPIKeys=<api key> :: <client id> :: <client secret>
Access keys for the Google APIs. More details are available at the Chromium development website. Note that the delimiters (::) are surrounded by a single space on each side.
Crie suas chaves de API conforme descrito aqui ( link ) e crie o arquivo ini para usar -los no Chromium Portable.
Trabalhou para mim! A sincronização está ativa agora.