Add Apps.AppListSearchResultDistanceFromOrigin UMA stat.

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 <string>
 #include <vector>
 
@@ skipping 93 matching lines @@
   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;
   }
 
+  int distance_from_origin() { return distance_from_origin_; }
+  void set_distance_from_origin(int distance) {
+    distance_from_origin_ = distance;
+  }
+
   const Actions& actions() const {
     return actions_;
   }
   void SetActions(const Actions& sets);
 
   // Whether the result can be automatically selected by a voice query.
   // (Non-voice results can still appear in the results list to be manually
   // selected.)
   bool voice_result() const { return voice_result_; }
 
@@ skipping 38 matching lines @@
   base::string16 title_;
   Tags title_tags_;
 
   base::string16 details_;
   Tags details_tags_;
 
   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_;
 
   ObserverList<SearchResultObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchResult);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_SEARCH_RESULT_H_