Implementing answer card hover highlight.

ui/app_list/search_result.h

 // 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.
 
 #ifndef UI_APP_LIST_SEARCH_RESULT_H_
 #define UI_APP_LIST_SEARCH_RESULT_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 98 matching lines @@
 
   const base::string16& details() const { return details_; }
   void set_details(const base::string16& details) { details_ = details; }
 
   const Tags& details_tags() const { return details_tags_; }
   void set_details_tags(const Tags& tags) { details_tags_ = tags; }
 
   views::View* view() const { return view_; }
   void set_view(views::View* view) { view_ = view; }
 
+  bool is_mouse_in_view() const { return mouse_is_in_view_; }
+  void SetIsMouseInView(bool mouse_is_inside);
+
   const std::string& id() const { return id_; }
 
   double relevance() const { return relevance_; }
   void set_relevance(double relevance) { relevance_ = relevance; }
 
   DisplayType display_type() const { return display_type_; }
   void set_display_type(DisplayType display_type) {
     display_type_ = display_type;
   }
 
@@ skipping 65 matching lines @@
 
   base::string16 details_;
   Tags details_tags_;
 
   // Unowned pointer to a view containing a rendered result, or nullptr if there
   // is no such view for the result.
   // The view has set_owned_by_client() property set. It's a responsibility of
   // SearchProvider to set this property and own this view.
   views::View* view_ = nullptr;
 
+  // If view_ isn't null, indicates whether the mouse cursor is inside view_.
+  bool mouse_is_in_view_ = false;
+
   std::string id_;
   double relevance_;
   DisplayType display_type_;
 
   // The Manhattan distance from the origin of all search results to this
   // result. This is logged for UMA.
   int distance_from_origin_;
 
   Actions actions_;
   bool voice_result_;
 
   bool is_installing_;
   int percent_downloaded_;
 
   base::ObserverList<SearchResultObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchResult);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_SEARCH_RESULT_H_