Add a skeleton Start Page to the experimental app list.

ui/app_list/views/contents_view.cc

Index: ui/app_list/views/contents_view.cc
diff --git a/ui/app_list/views/contents_view.cc b/ui/app_list/views/contents_view.cc
index 60968c39aa9f287f250cd14271494df446cadbd9..1b8b9a9edb58765a28296522cd9c63827a879bca 100644
--- a/ui/app_list/views/contents_view.cc
+++ b/ui/app_list/views/contents_view.cc
@@ -15,7 +15,9 @@
 #include "ui/app_list/views/app_list_main_view.h"
 #include "ui/app_list/views/apps_container_view.h"
 #include "ui/app_list/views/apps_grid_view.h"
+#include "ui/app_list/views/search_box_view.h"
 #include "ui/app_list/views/search_result_list_view.h"
+#include "ui/app_list/views/start_page_view.h"
 #include "ui/events/event.h"
 #include "ui/views/animation/bounds_animator.h"
 #include "ui/views/view_model.h"
@@ -28,6 +30,7 @@ namespace {
 // Indexes of interesting views in ViewModel of ContentsView.
 const int kIndexAppsContainer = 0;
 const int kIndexSearchResults = 1;
+const int kIndexStartPage = 2;
 
 const int kMinMouseWheelToSwitchPage = 20;
 const int kMinScrollToSwitchPage = 20;
@@ -44,6 +47,10 @@ SearchResultListView* GetSearchResultListView(views::ViewModel* model) {
       model->view_at(kIndexSearchResults));
 }
 
+SearchResultListView* GetStartPageView(views::ViewModel* model) {
+  return static_cast<SearchResultListView*>(model->view_at(kIndexStartPage));
+}
+
 }  // namespace
 
 ContentsView::ContentsView(AppListMainView* app_list_main_view,
@@ -53,7 +60,8 @@ ContentsView::ContentsView(AppListMainView* app_list_main_view,
     : show_state_(SHOW_APPS),
       pagination_model_(pagination_model),
       view_model_(new views::ViewModel),
-      bounds_animator_(new views::BoundsAnimator(this)) {
+      bounds_animator_(new views::BoundsAnimator(this)),
+      app_list_main_view_(app_list_main_view) {
   DCHECK(model);
   pagination_model_->SetTransitionDurations(
       kPageTransitionDurationInMs,
@@ -69,6 +77,15 @@ ContentsView::ContentsView(AppListMainView* app_list_main_view,
   AddChildView(search_results_view);
   view_model_->Add(search_results_view, kIndexSearchResults);
 
+  if (app_list::switches::IsExperimentalAppListEnabled()) {
+    content::WebContents* start_page_contents =
+        view_delegate->GetStartPageContents();
+    StartPageView* start_page_view =
+        new StartPageView(app_list_main_view, start_page_contents);
+    AddChildView(start_page_view);
+    view_model_->Add(start_page_view, kIndexStartPage);
+  }
+
   GetSearchResultListView(view_model_.get())->SetResults(model->results());
 }
 
@@ -107,6 +124,10 @@ void ContentsView::ShowStateChanged() {
     results_view->SetSelectedIndex(0);
   results_view->UpdateAutoLaunchState();
 
+  // Don't show the search box for the start page.
+  app_list_main_view_->search_box_view()->SetVisible(show_state_ !=

[xiyuan, 2014/05/07 17:32:16]

I prefer to add a method to AppListMainView and keep it there.

e.g.
void AppListMainView::OnContentsViewShowStateChanged() {
  search_box_view()->SetVisible(
    contents_view_->show_state() != ContentsView::SHOW_START_PAGE);
}

[calamity, 2014/05/08 07:46:32]

Done.

+                                                     SHOW_START_PAGE);
+
   AnimateToIdealBounds();
 }
 
@@ -124,6 +145,9 @@ void ContentsView::CalculateIdealBounds() {
       case SHOW_SEARCH_RESULTS:
         incoming_view_index = kIndexSearchResults;
         break;
+      case SHOW_START_PAGE:
+        incoming_view_index = kIndexStartPage;
+        break;
       default:
         NOTREACHED();
     }
@@ -206,6 +230,8 @@ bool ContentsView::OnKeyPressed(const ui::KeyEvent& event) {
       return GetAppsContainerView(view_model_.get())->OnKeyPressed(event);
     case SHOW_SEARCH_RESULTS:
       return GetSearchResultListView(view_model_.get())->OnKeyPressed(event);
+    case SHOW_START_PAGE:
+      return GetStartPageView(view_model_.get())->OnKeyPressed(event);
     default:
       NOTREACHED() << "Unknown show state " << show_state_;
   }