V8 log files are not availables

Environment

• CLI: 5.4.0
• Cross-platform modules: 5.4.2
• Android Runtime: 5.4.0

Describe the bug
V8 options can be passed on Android, but the default v8.log file is nowhere to be seen. Because of that, V8 profiling is not available.

To Reproduce

• Add --prof in v8 flags
• tns debug android
  Problem : v8 logs are not traced in tns, logcat nor a file.

Expected behavior
v8 default log file (v8.log) should be written on Android device and available. Also, --logfile should enable the filename customization.

Sample
src/package.json

{
    "main": "main.js",
    "android": {
        "v8Flags": "--expose_gc --prof --log-timer-events"
    }
}

Inizia con i flag V8 in src/package.json e segui come tns debug android li passa al runtime Android. Controlla dove logcat e i file del dispositivo ricevono l’output di V8, quindi verifica che --prof produca v8.log e che --logfile utilizzi il nome file richiesto.