[cros] Initialize OOBE in parallel when boot animation is disabled.

chrome/browser/resources/chromeos/login/user_pod_row.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview User pod row implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 15 matching lines @@
    * @type {number}
    * @const
    */
   var WALLPAPER_LOAD_DELAY_MS = 500;
 
   /**
    * Wallpaper load delay in milliseconds. TODO(nkostylev): Tune this constant.
    * @type {number}
    * @const
    */
-  var WALLPAPER_BOOT_LOAD_DELAY_MS = 500;
+  var WALLPAPER_BOOT_LOAD_DELAY_MS = 100;
 
   /**
    * Maximum time for which the pod row remains hidden until all user images
    * have been loaded.
    * @type {number}
    * @const
    */
   var POD_ROW_IMAGES_LOAD_TIMEOUT_MS = 3000;
 
   /**
@@ skipping 397 matching lines @@
    * @extends {HTMLDivElement}
    */
   var PodRow = cr.ui.define('podrow');
 
   PodRow.prototype = {
     __proto__: HTMLDivElement.prototype,
 
     // Whether this user pod row is shown for the first time.
     firstShown_: true,
 
+    // Whether the initial wallpaper load after boot has been requested. Used
+    // only if |Oobe.getInstance().shouldLoadWallpaperOnBoot()| is true.
+    bootWallpaperLoaded_: false,
+
     // True if inside focusPod().
     insideFocusPod_: false,
 
     // Focused pod.
     focusedPod_: undefined,
 
     // Activated pod, i.e. the pod of current login attempt.
     activatedPod_: undefined,
 
     // When moving through users quickly at login screen, set a timeout to
@@ skipping 223 matching lines @@
       this.focusedPod_ = podToFocus;
       if (podToFocus) {
         podToFocus.classList.remove('faded');
         podToFocus.classList.add('focused');
         podToFocus.reset(true);  // Reset and give focus.
         this.scrollPodIntoView(podToFocus);
         if (hadFocus) {
           // Delay wallpaper loading to let user tab through pods without lag.
           this.loadWallpaperTimeout_ = window.setTimeout(
               this.loadWallpaper_.bind(this), WALLPAPER_LOAD_DELAY_MS);
-        } else {
-          if (!this.firstShown_) {
-            // Load wallpaper immediately if there no pod was focused
-            // previously, and it is not a boot into user pod list case.
-            this.loadWallpaper_();
-          } else {
-            // Boot transition. Delay wallpaper load to remove jank
-            // happening when wallpaper load is competing for resources with
-            // login WebUI.
-            if (Oobe.getInstance().shouldLoadWallpaperOnBoot()) {
-              this.loadWallpaperTimeout_ = window.setTimeout(
-                  this.loadWallpaper_.bind(this), WALLPAPER_BOOT_LOAD_DELAY_MS);
-            }
-            this.firstShown_ = false;
-          }
+        } else if (!this.firstShown_) {
+          // Load wallpaper immediately if there no pod was focused
+          // previously, and it is not a boot into user pod list case.
+          this.loadWallpaper_();
+          this.firstShown_ = false;
         }
       } else {
         chrome.send('userDeselected');
       }
       this.insideFocusPod_ = false;
     },
 
     loadWallpaper_: function() {
       if (this.focusedPod_)
         chrome.send('userSelectedDelayed', [this.focusedPod_.user.username]);
@@ skipping 164 matching lines @@
     },
 
     /**
      * Called right after the pod row is shown.
      */
     handleAfterShow: function() {
       // Force input focus for user pod on show and once transition ends.
       if (this.focusedPod_) {
         var focusedPod = this.focusedPod_;
         var screen = this.parentNode;
+        var self = this;
         focusedPod.addEventListener('webkitTransitionEnd', function f(e) {
           if (e.target == focusedPod) {
             focusedPod.removeEventListener('webkitTransitionEnd', f);
             focusedPod.reset(true);
             // Notify screen that it is ready.
             screen.onShow();
+            // Boot transition: load wallpaper.
+            if (!self.bootWallpaperLoaded_ &&
+                Oobe.getInstance().shouldLoadWallpaperOnBoot()) {
+              self.loadWallpaperTimeout_ = window.setTimeout(
+                  self.loadWallpaper_.bind(self), WALLPAPER_BOOT_LOAD_DELAY_MS);
+              self.bootWallpaperLoaded_ = true;
+            }
           }
         });
       }
     },
 
     /**
      * Called right before the pod row is shown.
      */
     handleBeforeShow: function() {
       for (var event in this.listeners_) {
@@ skipping 22 matching lines @@
     handlePodImageLoad: function(pod) {
       var index = this.podsWithPendingImages_.indexOf(pod);
       if (index == -1) {
         return;
       }
 
       this.podsWithPendingImages_.splice(index, 1);
       if (this.podsWithPendingImages_.length == 0) {
         this.classList.remove('images-loading');
         chrome.send('userImagesLoaded');
-        // Report back user pods being painted.
-        window.webkitRequestAnimationFrame(function() {
-          chrome.send('loginVisible');
-        });
       }
     }
   };
 
   return {
     PodRow: PodRow
   };
 });