Add profile selector menu to app list.

ui/app_list/pagination_model.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/app_list/pagination_model.h"
 
 #include <algorithm>
 
 #include "ui/app_list/pagination_model_observer.h"
 #include "ui/base/animation/slide_animation.h"
@@ skipping 14 matching lines @@
 }
 
 void PaginationModel::SetTotalPages(int total_pages) {
   if (total_pages == total_pages_)
     return;
 
   total_pages_ = total_pages;
   if (selected_page_ < 0)
     SelectPage(0, false /* animate */);
   if (selected_page_ >= total_pages_)
-    SelectPage(total_pages_ - 1, false /* animate */);
+    SelectPage(std::max(total_pages_ - 1, 0), false /* animate */);
   FOR_EACH_OBSERVER(PaginationModelObserver, observers_, TotalPagesChanged());
 }
 
 void PaginationModel::SelectPage(int page, bool animate) {
   if (animate) {
     // -1 and |total_pages_| are valid target page for animation.
     DCHECK(page >= -1 && page <= total_pages_);
 
     if (!transition_animation_) {
       if (page == selected_page_)
@@ skipping 29 matching lines @@
         else
           transition_animation_->Show();
         pending_selected_page_ = -1;
       } else if (to_page != page) {
         pending_selected_page_ = page;
       } else {
         pending_selected_page_ = -1;
       }
     }
   } else {
-    DCHECK(page >= 0 && page < total_pages_);
+    DCHECK(total_pages_ == 0 || (page >= 0 && page < total_pages_));
 
     if (page == selected_page_)
       return;
 
     ResetTransitionAnimation();
 
     int old_selected = selected_page_;
     selected_page_ = page;
     NotifySelectedPageChanged(old_selected, selected_page_);
   }
@@ skipping 167 matching lines @@
   } else if (transition_animation_->GetCurrentValue() == 0) {
     // Hiding animation ends. No page change should happen.
     ResetTransitionAnimation();
   }
 
   if (next_target >= 0)
     SelectPage(next_target, true);
 }
 
 }  // namespace app_list