Bug 1360810 - Add telemetry for session restore privacy levels chosen by users r=mikedeboer data-r=bsmedberg

browser/components/sessionstore/SessionStore.jsm

@@ -615,6 +615,9 @@ var SessionStoreInternal = {
 
     this._initPrefs();
     this._initialized = true;
+
+    Telemetry.getHistogramById("FX_SESSION_RESTORE_PRIVACY_LEVEL").add(
+      Services.prefs.getIntPref("browser.sessionstore.privacy_level"));
   },
 
   /**

toolkit/components/telemetry/Histograms.json

@@ -5656,6 +5656,14 @@
     "n_buckets": 10,
     "description": "Session restore: Duration of the longest uninterruptible operation while collecting data in the content process (ms)"
   },
+  "FX_SESSION_RESTORE_PRIVACY_LEVEL": {
+    "alert_emails": ["session-restore-telemetry-alerts@mozilla.com"],
+    "expires_in_version": "60",
+    "kind": "enumerated",
+    "n_values": 3,
+    "bug_numbers": [1360810],
+    "description": "Session restore: The privacy level chosen by the user (0: Collect data from all sites, 1: Collect data only from non-HTTPS sites, 2: Collect no data)"
+  },
   "FX_SESSION_RESTORE_SERIALIZE_DATA_MS": {
     "alert_emails": ["session-restore-telemetry-alerts@mozilla.com"],
     "expires_in_version": "never",