Replace AllAppsTileItemView with ArrowExpandView

ui/app_list/views/start_page_view.cc

Index: ui/app_list/views/start_page_view.cc
diff --git a/ui/app_list/views/start_page_view.cc b/ui/app_list/views/start_page_view.cc
index ad3b9b8878da615294abda11bb610b4596484779..b56230264c04f163071ee75cd65b993816c2bf27 100644
--- a/ui/app_list/views/start_page_view.cc
+++ b/ui/app_list/views/start_page_view.cc
@@ -23,6 +23,7 @@
 #include "ui/app_list/views/app_list_main_view.h"
 #include "ui/app_list/views/contents_view.h"
 #include "ui/app_list/views/custom_launcher_page_view.h"
+#include "ui/app_list/views/expand_arrow_view.h"
 #include "ui/app_list/views/indicator_chip_view.h"
 #include "ui/app_list/views/search_box_view.h"
 #include "ui/app_list/views/search_result_container_view.h"
@@ -56,6 +57,7 @@ constexpr int kStartPageSearchBoxWidthFullscreen = 544;
 constexpr int kWebViewWidth = 700;
 constexpr int kWebViewHeight = 224;
 
+constexpr int kExpandArrowTopPadding = 28;
 constexpr int kLauncherPageBackgroundWidth = 400;
 
 }  // namespace
@@ -103,11 +105,14 @@ StartPageView::StartPageView(AppListMainView* app_list_main_view,
       instant_container_(new views::View),
       custom_launcher_page_background_(new CustomLauncherPageBackgroundView(
           view_delegate_->GetModel()->custom_launcher_page_name())),
-      suggestions_container_(new SuggestionsContainerView(
-          app_list_main_view->contents_view(),
-          new AllAppsTileItemView(app_list_main_view_->contents_view(),
-                                  app_list_view))),
       is_fullscreen_app_list_enabled_(features::IsFullscreenAppListEnabled()) {
+  suggestions_container_ = new SuggestionsContainerView(
+      app_list_main_view->contents_view(),
+      is_fullscreen_app_list_enabled_
+          ? nullptr
+          : new AllAppsTileItemView(app_list_main_view_->contents_view(),
+                                    app_list_view));
+
   search_box_spacer_view_->SetPreferredSize(gfx::Size(
       is_fullscreen_app_list_enabled_ ? kStartPageSearchBoxWidthFullscreen
                                       : kStartPageSearchBoxWidth,
@@ -125,6 +130,11 @@ StartPageView::StartPageView(AppListMainView* app_list_main_view,
 
   // The view containing the start page tiles.
   AddChildView(suggestions_container_);
+  if (is_fullscreen_app_list_enabled_) {
+    expand_arrow_view_ = new ExpandArrowView(
+        app_list_main_view_->contents_view(), app_list_view);
+    AddChildView(expand_arrow_view_);
+  }
   AddChildView(custom_launcher_page_background_);
 
   suggestions_container_->SetResults(view_delegate_->GetModel()->results());
@@ -245,6 +255,18 @@ void StartPageView::Layout() {
   }
   suggestions_container_->SetBoundsRect(bounds);
 
+  if (expand_arrow_view_) {
+    gfx::Rect expand_arrow_rect(GetContentsBounds());
+    int left_right_padding =
+        (bounds.width() - expand_arrow_view_->GetPreferredSize().width()) / 2;
+
+    expand_arrow_rect.Inset(left_right_padding, 0, left_right_padding, 0);
+    expand_arrow_rect.set_y(bounds.bottom() + kExpandArrowTopPadding);
+    expand_arrow_rect.set_height(
+        expand_arrow_view_->GetPreferredSize().height());
+    expand_arrow_view_->SetBoundsRect(expand_arrow_rect);
+  }
+
   CustomLauncherPageView* custom_launcher_page_view =
       app_list_main_view_->contents_view()->custom_page_view();
   if (!custom_launcher_page_view)