Added HALF, FULLSCREEN_ALL_APPS, and FULLSCREEN_SEARCH.

ui/app_list/views/search_box_view.cc

Index: ui/app_list/views/search_box_view.cc
diff --git a/ui/app_list/views/search_box_view.cc b/ui/app_list/views/search_box_view.cc
index 599f298e8c5f24eec2bbe104450765527e879a72..81cdb9bc0976b0f82ca6dbdc3cb56c6f47df4be0 100644
--- a/ui/app_list/views/search_box_view.cc
+++ b/ui/app_list/views/search_box_view.cc
@@ -345,11 +345,8 @@ void SearchBoxView::ContentsChanged(views::Textfield* sender,
   UpdateModel();
   view_delegate_->AutoLaunchCanceled();
   NotifyQueryChanged();
-
-  if (IsFullscreenAppListEnabled() && !app_list_view_->is_fullscreen()) {
-    // If the app list is in the peeking state, switch it to fullscreen.
-    app_list_view_->SetState(AppListView::FULLSCREEN);
-  }
+  if (IsFullscreenAppListEnabled())
+    app_list_view_->SetStateFromSearchBoxView(search_box_->text().empty());
 }
 
 bool SearchBoxView::HandleKeyEvent(views::Textfield* sender,