Bug 964511 - Delay snippets initialization until after first page load. r=margaret

mobile/android/components/Snippets.js

@@ -322,6 +322,10 @@ Snippets.prototype = {
   observe: function(subject, topic, data) {
     switch(topic) {
       case "profile-after-change":
+        Services.obs.addObserver(this, "browser-delayed-startup-finished", false);
+        break;
+      case "browser-delayed-startup-finished":
+        Services.obs.removeObserver(this, "browser-delayed-startup-finished", false);
         if (Services.prefs.getBoolPref("browser.snippets.syncPromo.enabled")) {
           loadSyncPromoBanner();
         }