Fixed position of plus image on action box button; added ICON_CENTERED placement to TextButton

ui/views/examples/button_example.cc

 // Copyright (c) 2012 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/views/examples/button_example.h"
 
 #include "base/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
@@ skipping 59 matching lines @@
           text_button_->SetText(ASCIIToUTF16("Button"));
         }
       } else {
         switch (text_button_->icon_placement()) {
           case TextButton::ICON_ON_LEFT:
             text_button_->set_icon_placement(TextButton::ICON_ON_RIGHT);
             break;
           case TextButton::ICON_ON_RIGHT:
             text_button_->set_icon_placement(TextButton::ICON_ON_LEFT);
             break;
+          case TextButton::ICON_CENTERED:
+            // Do nothing.
+            break;
         }
       }
     } else if (event.IsAltDown()) {
       if (text_button_->HasIcon())
         text_button_->SetIcon(gfx::ImageSkia());
       else
         text_button_->SetIcon(*icon_);
     } else {
       switch (alignment_) {
         case TextButton::ALIGN_LEFT:
@@ skipping 28 matching lines @@
         text_button_->set_border(new TextButtonBorder());
     }
   } else if (event.IsAltDown()) {
     text_button_->SetIsDefault(!text_button_->is_default());
   }
   example_view()->GetLayoutManager()->Layout(example_view());
 }
 
 }  // namespace examples
 }  // namespace views