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 77236d3f3c1d9ae1a2c044dee41923f7cf57823b..7841388bd63fffa5cdfefc49a25236866a59fb02 100644
--- a/ui/app_list/views/search_box_view.cc
+++ b/ui/app_list/views/search_box_view.cc
@@ -54,7 +54,6 @@ constexpr SkColor kHintTextColor = SkColorSetARGBMacro(0xFF, 0xA0, 0xA0, 0xA0);
 
 constexpr int kBackgroundBorderCornerRadius = 2;
 constexpr int kBackgroundBorderCornerRadiusFullscreen = 24;
-
 constexpr int kGoogleIconSize = 24;
 constexpr int kMicIconSize = 24;
 
@@ -368,11 +367,8 @@ void SearchBoxView::ContentsChanged(views::Textfield* sender,
   UpdateModel();
   view_delegate_->AutoLaunchCanceled();
   NotifyQueryChanged();
-
-  if (is_fullscreen_app_list_enabled_ && !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 (is_fullscreen_app_list_enabled_)
+    app_list_view_->SetStateFromSearchBoxView(search_box_->text().empty());
 }
 
 bool SearchBoxView::HandleKeyEvent(views::Textfield* sender,