Add a skeleton Start Page to the experimental app list.

ui/app_list/views/contents_switcher_view.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/app_list/views/contents_switcher_view.h"
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/views/contents_view.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/controls/button/custom_button.h"
@@ skipping 50 matching lines @@
 
 ContentsSwitcherView::ContentsSwitcherView(ContentsView* contents_view)
     : contents_view_(contents_view), buttons_(new views::View) {
   AddChildView(buttons_);
 
   buttons_->SetLayoutManager(new views::BoxLayout(
       views::BoxLayout::kHorizontal, 0, 0, kButtonSpacing));
   buttons_->AddChildView(
       new ContentsSwitcherButton(this, ContentsView::SHOW_APPS));
   buttons_->AddChildView(
+      new ContentsSwitcherButton(this, ContentsView::SHOW_START_PAGE));
+  buttons_->AddChildView(
       new ContentsSwitcherButton(this, ContentsView::SHOW_SEARCH_RESULTS));
 }
 
 ContentsSwitcherView::~ContentsSwitcherView() {}
 
 gfx::Size ContentsSwitcherView::GetPreferredSize() {
   return gfx::Size(buttons_->GetPreferredSize().width(), kPreferredHeight);
 }
 
 void ContentsSwitcherView::Layout() {
   gfx::Rect rect(GetContentsBounds());
 
   // Makes |buttons_| horizontally center and vertically fill.
   gfx::Size buttons_size(buttons_->GetPreferredSize());
   gfx::Rect buttons_bounds(rect.CenterPoint().x() - buttons_size.width() / 2,
                            rect.y(),
                            buttons_size.width(),
                            rect.height());
   buttons_->SetBoundsRect(gfx::IntersectRects(rect, buttons_bounds));
 }
 
 void ContentsSwitcherView::ButtonPressed(views::Button* sender,
                                          const ui::Event& event) {
   contents_view_->SetShowState(
       static_cast<ContentsView::ShowState>(sender->tag()));
 }
 
 }  // namespace app_list