app_list: Show apps grid after installing from cws result.

ui/app_list/views/search_result_view_delegate.h

 // 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.
 
 #ifndef UI_APP_LIST_VIEWS_SEARCH_RESULT_VIEW_DELEGATE_H_
 #define UI_APP_LIST_VIEWS_SEARCH_RESULT_VIEW_DELEGATE_H_
 
 namespace app_list {
 
 class SearchResultView;
 
 class SearchResultViewDelegate {
  public:
   // Called when the search result is activated.
   virtual void SearchResultActivated(SearchResultView* view,
                                      int event_flags) = 0;
 
   // Called when one of the search result's optional action icons is activated.
   // |action_index| contains the 0-based index of the action.
   virtual void SearchResultActionActivated(SearchResultView* view,
                                            size_t action_index,
                                            int event_flags) = 0;
 
+  // Called when the app represented by the search result is installed.
+  virtual void OnSearchResultInstalled(SearchResultView* view) = 0;
+
  protected:
   virtual ~SearchResultViewDelegate() {}
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_SEARCH_RESULT_VIEW_DELEGATE_H_