Ignore updates to app list Most Likely apps when animating off the start page.

ui/app_list/views/start_page_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/start_page_view.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_item.h"
 #include "ui/app_list/app_list_model.h"
@@ skipping 216 matching lines @@
 
   if (app_list_main_view_->contents_view()->ShouldShowCustomPageClickzone()) {
     custom_page_clickzone->ShowInactive();
     return;
   }
 
   custom_page_clickzone->Hide();
 }
 
 int StartPageView::Update() {
+  // Ignore updates and disable buttons when transitioning to a different state.
+  if (app_list_main_view_->contents_view()->GetActiveState() !=
+      AppListModel::STATE_START) {
+    for (size_t i = 0; i < search_result_tile_views_.size(); ++i)

[Matt Giuca, 2015/02/04 05:55:24]

for (auto& view : search_result_tile_views_)
 ...

+      search_result_tile_views_[i]->SetEnabled(false);
+
+    return num_results();
+  }
+
   std::vector<SearchResult*> display_results =
       AppListModel::FilterSearchResultsByDisplayType(
           results(), SearchResult::DISPLAY_RECOMMENDATION, kNumStartPageTiles);
 
   // Update the tile item results.
   for (size_t i = 0; i < search_result_tile_views_.size(); ++i) {
     SearchResult* item = NULL;
     if (i < display_results.size())
       item = display_results[i];
     search_result_tile_views_[i]->SetSearchResult(item);
+    search_result_tile_views_[i]->SetEnabled(true);
   }
 
   tiles_container_->Layout();
   Layout();
   // Add 1 to the results size to account for the all apps button.
   return display_results.size() + 1;
 }
 
 void StartPageView::UpdateSelectedIndex(int old_selected, int new_selected) {
   if (old_selected >= 0)
     GetTileItemView(old_selected)->SetSelected(false);
 
   if (new_selected >= 0)
     GetTileItemView(new_selected)->SetSelected(true);
 }
 
 TileItemView* StartPageView::GetTileItemView(size_t index) {
   DCHECK_GT(kNumStartPageTiles + 1, index);
   if (index == kNumStartPageTiles)
     return all_apps_button_;
 
   return search_result_tile_views_[index];
 }
 
 }  // namespace app_list