Bug 1397744 - Show the Sync animation immediately after clicking the manual sync button. r=markh

MozReview-Commit-ID: AIBjAZZlYX6

--HG--
extra : rebase_source : 562023d6bfdb78aa2fad6c42948b57db8bc04f99

browser/base/content/browser-sync.js

@@ -524,6 +524,7 @@ var gSync = {
     }
     const state = UIState.get();
     if (state.status == UIState.STATUS_SIGNED_IN) {
+      this.updateSyncStatus({ syncing: true });
       setTimeout(() => Weave.Service.errorHandler.syncAndReportErrors(), 0);
     }
   },

browser/components/customizableui/test/browser_synced_tabs_menu.js

@@ -7,6 +7,7 @@
 requestLongerTimeout(2);
 
 let {SyncedTabs} = Cu.import("resource://services-sync/SyncedTabs.jsm", {});
+Cu.import("resource://services-sync/UIState.jsm");
 
 XPCOMUtils.defineLazyModuleGetter(this, "UITour", "resource:///modules/UITour.jsm");
 
@@ -48,8 +49,12 @@ add_task(async function setup() {
   for (let id of ["sync-reauth-state", "sync-setup-state", "sync-syncnow-state"]) {
     initialObserverStates[id] = document.getElementById(id).hidden;
   }
+  let origNotifyStateUpdated = UIState._internal.notifyStateUpdated;
+  // Sync start-up will interfere with our tests, don't let UIState send UI updates.
+  UIState._internal.notifyStateUpdated = () => {};
 
   registerCleanupFunction(() => {
+    UIState._internal.notifyStateUpdated = origNotifyStateUpdated;
     SyncedTabs._internal = oldInternal;
     for (let [id, initial] of Object.entries(initialObserverStates)) {
       document.getElementById(id).hidden = initial;