Bug 1239102 - Create histogram probe to track % of people setting a custom home page. r=sebastian p=mfinkle

--HG--
extra : commitid : At83eWERMce
extra : rebase_source : 9708da7f77cca84c86324841792a00d752c2704b

mobile/android/base/java/org/mozilla/gecko/BrowserApp.java

@@ -1689,6 +1689,8 @@ public class BrowserApp extends GeckoApp
             Telemetry.addToHistogram("FENNEC_READING_LIST_COUNT", db.getReadingListAccessor().getCount(cr));
             Telemetry.addToHistogram("BROWSER_IS_USER_DEFAULT", (isDefaultBrowser(Intent.ACTION_VIEW) ? 1 : 0));
             Telemetry.addToHistogram("FENNEC_TABQUEUE_ENABLED", (TabQueueHelper.isTabQueueEnabled(BrowserApp.this) ? 1 : 0));
+            Telemetry.addToHistogram("FENNEC_CUSTOM_HOMEPAGE", (TextUtils.isEmpty(getHomepage()) ? 0 : 1));
+
             if (Versions.feature16Plus) {
                 Telemetry.addToHistogram("BROWSER_IS_ASSIST_DEFAULT", (isDefaultBrowser(Intent.ACTION_ASSIST) ? 1 : 0));
             }

toolkit/components/telemetry/Histograms.json

@@ -8990,6 +8990,13 @@
     "kind": "boolean",
     "description": "Has the tab queue functionality been enabled."
   },
+  "FENNEC_CUSTOM_HOMEPAGE": {
+    "expires_in_version": "50",
+    "alert_emails": ["mobile-frontend@mozilla.com"],
+    "bug_numbers": [1239102],
+    "kind": "boolean",
+    "description": "Whether the user has set a custom homepage."
+  },
   "GRAPHICS_DRIVER_STARTUP_TEST": {
     "alert_emails": ["danderson@mozilla.com"],
     "expires_in_version": "never",