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 13 matching lines @@
 PaginationModel::~PaginationModel() {
 }
 
 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 */);
+  if (selected_page_ >= total_pages_) {

[koz (OOO until 15th September), 2013/08/05 01:09:11]

nit: no curlies

+    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(page == 0 || (page > 0 && page < total_pages_));

[koz (OOO until 15th September), 2013/08/05 01:09:11]

This change seems unnecessary.

[calamity, 2013/08/08 04:52:12]

Oops. Should be total_pages_ == 0. This needed to be here to avoid DCHECKing
when notifying the pagination model that apps have been added to the app list
when repopulating the model due to profile switch.

 
     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