Fix several crashes for ARC app launcher.

chrome/browser/ui/app_list/model_pref_updater.cc

Index: chrome/browser/ui/app_list/model_pref_updater.cc
diff --git a/chrome/browser/ui/app_list/model_pref_updater.cc b/chrome/browser/ui/app_list/model_pref_updater.cc
index ea79bd9d58473968ea12092466fc45a41178b885..8c0255723b3ff24c53a25ecb87b6b543c1b4eb44 100644
--- a/chrome/browser/ui/app_list/model_pref_updater.cc
+++ b/chrome/browser/ui/app_list/model_pref_updater.cc
@@ -10,6 +10,10 @@
 #include "ui/app_list/app_list_item.h"
 #include "ui/app_list/app_list_model.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/ui/app_list/arc/arc_app_item.h"
+#endif
+
 namespace app_list {
 
 ModelPrefUpdater::ModelPrefUpdater(AppListPrefs* app_list_prefs,
@@ -41,6 +45,10 @@ void ModelPrefUpdater::UpdatePrefsFromAppListItem(AppListItem* item) {
     info.item_type = AppListPrefs::AppListInfo::FOLDER_ITEM;
   else if (item->GetItemType() == ExtensionAppItem::kItemType)
     info.item_type = AppListPrefs::AppListInfo::APP_ITEM;
+#if defined(OS_CHROMEOS)
+  else if (item->GetItemType() == ArcAppItem::kItemType)

[khmel, 2015/12/08 05:42:51]

'grep -r "ExtensionAppItem::kItemType" --include=*.cc' shows 2 places where
ExtensionAppItem::kItemType are used without  ArcAppItem::kItemType. One place
is here, second place is here:
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/ui/....


ModelPrefUpdaterTest works with mock item that has extension type only.

So adding new type only here.

+    info.item_type = AppListPrefs::AppListInfo::APP_ITEM;
+#endif
   else
     NOTREACHED();