Reset the experimental app list to the start page on dismiss.

ui/app_list/views/app_list_main_view.cc

 // Copyright 2013 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/app_list_main_view.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 168 matching lines @@
   if (icon_loading_wait_timer_.IsRunning())
     return;
 
   icon_loading_wait_timer_.Start(
       FROM_HERE,
       base::TimeDelta::FromMilliseconds(kMaxIconLoadingWaitTimeInMs),
       this, &AppListMainView::OnIconLoadingWaitTimer);
 }
 
 void AppListMainView::ResetForShow() {
+  if (switches::IsExperimentalAppListEnabled()) {
+    contents_view_->SetActivePage(contents_view_->GetPageIndexForNamedPage(
+        ContentsView::NAMED_PAGE_START));
+  }
   contents_view_->apps_container_view()->ResetForShowApps();
   // We clear the search when hiding so when app list appears it is not showing
   // search results.
   search_box_view_->ClearSearch();
 }
 
 void AppListMainView::Close() {
   icon_loading_wait_timer_.Stop();
   contents_view_->CancelDrag();
 }
@@ skipping 142 matching lines @@
   // Resubmit the query via a posted task so that all observers for the
   // uninstall notification are notified.
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&AppListMainView::QueryChanged,
                  weak_ptr_factory_.GetWeakPtr(),
                  search_box_view_));
 }
 
 }  // namespace app_list