Bug 1447393 - Keep empty content process alive on Android r=jimm,mrbkap

MozReview-Commit-ID: 2mZwbcjngnE

mobile/android/app/geckoview-prefs.js

@@ -8,3 +8,5 @@
 
 pref("privacy.trackingprotection.pbmode.enabled", false);
 pref("dom.ipc.processCount", 1);
+pref("dom.ipc.keepProcessesAlive.web", 1);
+pref("dom.ipc.processPrelaunch.enabled", false);