Handle app custom icon via aura::Window property.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 2318 matching lines @@
 
   // No custom icon set. Acitivating windows should not change icon.
   EXPECT_FALSE(item_delegate->image_set_by_controller());
   window1->Activate();
   EXPECT_FALSE(item_delegate->image_set_by_controller());
   window2->Activate();
   EXPECT_FALSE(item_delegate->image_set_by_controller());
 
   // Set custom icon on active item. Icon should change to custom.
   arc_test_.app_instance()->SendTaskDescription(2, std::string(), png_data);
+  base::RunLoop().RunUntilIdle();
   EXPECT_TRUE(item_delegate->image_set_by_controller());
 
   // Switch back to the item without custom icon. Icon should be changed to
   // default.
   window1->Activate();
   EXPECT_FALSE(item_delegate->image_set_by_controller());
   // Test that setting an invalid icon should not change custom icon.
   arc_test_.app_instance()->SendTaskDescription(1, std::string(), png_data);
   EXPECT_TRUE(item_delegate->image_set_by_controller());
   arc_test_.app_instance()->SendTaskDescription(1, std::string(),
@@ skipping 1936 matching lines @@
   EXPECT_EQ(ash::SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS,
             shelf_controller->auto_hide());
   EXPECT_EQ(2u, shelf_controller->auto_hide_change_count());
 
   PrefService* prefs = profile()->GetTestingPrefService();
   EXPECT_EQ("Left", prefs->GetString(prefs::kShelfAlignmentLocal));
   EXPECT_EQ("Left", prefs->GetString(prefs::kShelfAlignment));
   EXPECT_EQ("Always", prefs->GetString(prefs::kShelfAutoHideBehaviorLocal));
   EXPECT_EQ("Always", prefs->GetString(prefs::kShelfAutoHideBehavior));
 }