[win] Add a progress bar in the app launcher for app installs.

ui/app_list/app_list_item_model.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 "ui/app_list/app_list_item_model.h"
 
 #include "base/logging.h"
 #include "ui/app_list/app_list_item_model_observer.h"
 
 namespace app_list {
 
-AppListItemModel::AppListItemModel() : highlighted_(false) {
+AppListItemModel::AppListItemModel()
+    : highlighted_(false),
+      is_installing_(false),
+      percent_downloaded_(-1) {
 }
 
 AppListItemModel::~AppListItemModel() {
 }
 
 void AppListItemModel::SetIcon(const gfx::ImageSkia& icon) {
   icon_ = icon;
   FOR_EACH_OBSERVER(AppListItemModelObserver, observers_, ItemIconChanged());
 }
 
 void AppListItemModel::SetTitle(const std::string& title) {
   if (title_ == title)
     return;
 
   title_ = title;
   FOR_EACH_OBSERVER(AppListItemModelObserver, observers_, ItemTitleChanged());
 }
 
 void AppListItemModel::SetHighlighted(bool highlighted) {
   if (highlighted_ == highlighted)
     return;
 
   highlighted_ = highlighted;
   FOR_EACH_OBSERVER(AppListItemModelObserver,
                     observers_,
                     ItemHighlightedChanged());
 }
 
+void AppListItemModel::SetIsInstalling(bool is_installing) {
+  if (is_installing_ == is_installing)
+    return;
+  is_installing_ = is_installing;
+  FOR_EACH_OBSERVER(AppListItemModelObserver,
+                    observers_,
+                    ItemIsInstallingChanged());
+}
+
+void AppListItemModel::SetPercentDownloaded(int percent_downloaded) {
+  if (percent_downloaded_ == percent_downloaded)
+    return;
+  percent_downloaded_ = percent_downloaded;
+  FOR_EACH_OBSERVER(AppListItemModelObserver,
+                    observers_,
+                    ItemPercentDownloadedChanged());
+}
+
 void AppListItemModel::AddObserver(AppListItemModelObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void AppListItemModel::RemoveObserver(AppListItemModelObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 ui::MenuModel* AppListItemModel::GetContextMenuModel() {
   return NULL;
 }
 
 }  // namespace app_list