As of now, Google Chrome BETA does not support themes officially and provides no way to manage them, However, free software are now available to easily create, install and manage themes for the browser.
Google Chrome Firefox Theme
Xchrome Theme Manager is the first and only software currently available to install and manage Google Chrome Themes, The free software is still in BETA but lets you fully automate the installation of Google Chrome themes without any hassles.
Xchrome Theme Manager is the first and only software currently available to install and manage Google Chrome Themes, The free software is still in BETA but lets you fully automate the installation of Google Chrome themes without any hassles.