Experimental launcher: Switcher buttons are larger and centered.

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/views/contents_view.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/views/controls/button/custom_button.h"
 #include "ui/views/controls/button/image_button.h"
@@ skipping 14 matching lines @@
       views::BoxLayout::kHorizontal, 0, 0, kButtonSpacing);
   layout->set_main_axis_alignment(views::BoxLayout::MAIN_AXIS_ALIGNMENT_CENTER);
   layout->set_minimum_cross_axis_size(kMinimumHeight);
   SetLayoutManager(layout);
 }
 
 ContentsSwitcherView::~ContentsSwitcherView() {}
 
 void ContentsSwitcherView::AddSwitcherButton(int resource_id, int page_index) {
   views::ImageButton* button = new views::ImageButton(this);
+  button->SetMinimumImageSize(gfx::Size(kMinimumHeight, kMinimumHeight));
+  button->SetImageAlignment(views::ImageButton::ALIGN_CENTER,
+                            views::ImageButton::ALIGN_MIDDLE);
   button->SetImage(
       views::CustomButton::STATE_NORMAL,
       ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id));
   button->set_tag(page_index);
 
   AddChildView(button);
 }
 
 void ContentsSwitcherView::ButtonPressed(views::Button* sender,
                                          const ui::Event& event) {
@@ skipping 19 matching lines @@
   if (pm.IsRevertingCurrentTransition()) {
     // Swap the direction if the transition is reversed.
     old_selected = pm.transition().target_page;
     new_selected = pm.selected_page();
   }
 
   SelectedPageChanged(old_selected, new_selected);
 }
 
 }  // namespace app_list