bob.json

{
    "flat": {
        "contexts": {
            "gpii-default": {
                "name": "Default preferences",
                "preferences": {
                    "http://registry.gpii.net/applications/net.gpii.chromeExtension": {
                        "lineSpace": 1.5,
                        "highContrastEnabled": true,
                        "highContrastTheme": "white-black",
                        "dictionaryEnabled": true,
                        "inputsLargerEnabled": true,
                        "fontSize": 1.5
                    },
                    "http://registry.gpii.net/common/highContrastEnabled": true,
                    "http://registry.gpii.net/common/highContrastTheme": "white-black"
                }
            }
        }
    }
}

solutions registry entry

    "net.gpii.chromeExtension": {
        "name": "GPII Chrome extension",
        "contexts": {
            "OS": [{
                "id": "win32",
                "version": ">=5.0"
            }]
        },
        "settingsHandlers": {
            "config": {
                "type": "gpii.settingsHandlers.webSockets",
                "options": {
                    "path": "net.gpii.chromeExtension"
                },
                "capabilities": [],
                "capabilitiesTransformations": {}
            }
        },
        "configure": [
            "settings.config"
        ],
        "restore": [
            "settings.config"
        ],
        "start": [],
        "stop": [],
        "isInstalled": [
            {
                "type": "gpii.deviceReporter.alwaysInstalled"
            }
        ]
    }