Add LauncherIconObserver.

ash/test/test_shell_delegate.cc

 // 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.
 
 #include "ash/test/test_shell_delegate.h"
 
 #include <algorithm>
 
 #include "ash/screenshot_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
+#include "ash/test/test_launcher_delegate.h"
 #include "grit/ui_resources.h"
 #include "ui/aura/window.h"
 
 namespace ash {
 namespace test {
 
 TestShellDelegate::TestShellDelegate() : locked_(false) {
 }
 
 TestShellDelegate::~TestShellDelegate() {
@@ skipping 29 matching lines @@
 }
 
 void TestShellDelegate::StartPartialScreenshot(
     ScreenshotDelegate* screenshot_delegate) {
   if (screenshot_delegate)
     screenshot_delegate->HandleTakePartialScreenshot(NULL, gfx::Rect());
 }
 
 LauncherDelegate* TestShellDelegate::CreateLauncherDelegate(
     ash::LauncherModel* model) {
-  return NULL;
+  return new TestLauncherDelegate(model);
 }
 
 SystemTrayDelegate* TestShellDelegate::CreateSystemTrayDelegate(
     SystemTray* tray) {
   return NULL;
 }
 
 UserWallpaperDelegate* TestShellDelegate::CreateUserWallpaperDelegate() {
   return NULL;
 }
 
 }  // namespace test
 }  // namespace ash