An object containing information about the current platform.
Values of this type are objects, which contain the following properties:
runtime.PlatformOs. The platform's operating system.
runtime.PlatformArch. The platform's processor architecture.
runtime.PlatformNaclArch. The native client architecture. This may be different from
archon some platforms.
BCD tables only load in the browser
Note: This API is based on Chromium's
chrome.runtime API. This documentation is derived from
runtime.json in the Chromium code.