Tests the way service workers don't enable DOM agent and does enable Debugger agent.

Debugger-related command should be issued: {
    "id": "<id>",
    "method": "Debugger.enable",
    "params": {
        "maxScriptsCacheSize": 100000000
    },
    "sessionId": "<id>"
}
Suspending targets.
Resuming targets.
Debugger-related command should be issued: {
    "id": "<id>",
    "method": "Debugger.enable",
    "params": {
        "maxScriptsCacheSize": 100000000
    },
    "sessionId": "<id>"
}