Bug 958891 - Make Fennec about:home advertise Firefox Accounts + Sync banner. r=bnicholson

mobile/android/app/mobile.js

@@ -810,8 +810,9 @@ pref("browser.snippets.geoUrl", "https://geo.mozilla.org/country.json");
 // URL used to ping metrics with stats about which snippets have been shown
 pref("browser.snippets.statsUrl", "https://snippets-stats.mozilla.org/mobile");
 
-// This pref requires a restart to take effect.
+// These prefs require a restart to take effect.
 pref("browser.snippets.enabled", false);
+pref("browser.snippets.syncPromo.enabled", false);
 
 #ifdef MOZ_ANDROID_SYNTHAPKS
 // The URL of the APK factory from which we obtain APKs for webapps.

mobile/android/components/Snippets.js

@@ -291,6 +291,28 @@ function _httpGetRequest(url, callback) {
   xhr.send(null);
 }
 
+function loadSyncPromoBanner() {
+  // XXX: Use Accounts.jsm to check if a sync account exists (bug 917942).
+  let syncAccountExists = false;
+  if (syncAccountExists) {
+    // Don't show the promo banner if a sync account already exists.
+    return;
+  }
+
+  let stringBundle = Services.strings.createBundle("chrome://browser/locale/sync.properties");
+  let text = stringBundle.GetStringFromName("promoBanner.message.text");
+  let link = stringBundle.GetStringFromName("promoBanner.message.link");
+
+  Home.banner.add({
+    text: text + "<a href=\"#\">" + link + "</a>",
+    icon: "drawable://sync_promo",
+    onclick: function() {
+      // XXX: Use Accounts.jsm to launch sync set-up activity (bug 917942).
+      gChromeWin.alert("Launch sync set-up activity!");
+    }
+  });
+}
+
 function Snippets() {}
 
 Snippets.prototype = {
@@ -298,12 +320,15 @@ Snippets.prototype = {
   classID: Components.ID("{a78d7e59-b558-4321-a3d6-dffe2f1e76dd}"),
 
   observe: function(subject, topic, data) {
-    if (!Services.prefs.getBoolPref("browser.snippets.enabled")) {
-      return;
-    }
     switch(topic) {
       case "profile-after-change":
-        loadSnippetsFromCache();
+        if (Services.prefs.getBoolPref("browser.snippets.syncPromo.enabled")) {
+          loadSyncPromoBanner();
+        }
+
+        if (Services.prefs.getBoolPref("browser.snippets.enabled")) {
+          loadSnippetsFromCache();
+        }
         break;
     }
   },

mobile/android/locales/en-US/chrome/sync.properties

@@ -31,3 +31,10 @@ sync.setup.tryagain=Try again
 sync.setup.manual=Manual setup
 
 sync.message.notabs=No tabs from your other computers.
+
+# LOCALIZATION NOTE (promoBanner.message.text): First part of the message displayed in a
+# banner on about:home. The final space separates this text from the link.
+promoBanner.message.text=Sync is brand new and easier than ever.\u0020
+
+# LOCALIZATION NOTE (promoBanner.message.link): Second part of the message, styled as a link.
+promoBanner.message.link=Tap here to learn more