Bug 1185783 - Part 2: Move promiseNotification to head.js. r=margaret

--HG--
extra : commitid : 7WUj4UcXTRy
extra : rebase_source : 9e3d1ddbb5a9bb67b0e119a87cadaa0a19d717ed

mobile/android/tests/browser/chrome/head.js

@@ -18,3 +18,17 @@ function promiseBrowserEvent(browser, eventType) {
     info("Now waiting for " + eventType + " event from browser");
   });
 }
+
+function promiseNotification(topic) {
+  Cu.import("resource://gre/modules/Services.jsm");
+
+  return new Promise((resolve, reject) => {
+    function observe(subject, topic, data) {
+      info("Received " + topic + " notification from Gecko");
+      Services.obs.removeObserver(observe, topic);
+      resolve();
+    }
+    Services.obs.addObserver(observe, topic, false);
+    info("Now waiting for " + topic + " notification from Gecko");
+  });
+}

mobile/android/tests/browser/chrome/test_reader_view.html

@@ -18,16 +18,6 @@ Migrated from Robocop: https://bugzilla.mozilla.org/show_bug.cgi?id=1184186
 
   Cu.import("resource://gre/modules/Services.jsm");
 
-  function promiseNotification(topic) {
-    return new Promise((resolve, reject) => {
-      function observe(subject, topic, data) {
-        Services.obs.removeObserver(observe, topic);
-        resolve();
-      }
-      Services.obs.addObserver(observe, topic, false);
-    });
-  }
-
   add_task(function* test_reader_view_visibility() {
     let gWin = Services.wm.getMostRecentWindow("navigator:browser");
     let BrowserApp = gWin.BrowserApp;