Add Apps.AppListSearchResultDistanceFromOrigin UMA stat.

ui/app_list/search_result.cc

 // 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.
 
 #include "ui/app_list/search_result.h"
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/search_result_observer.h"
 
 namespace app_list {
@@ skipping 12 matching lines @@
     : tooltip_text(tooltip_text),
       label_text(label_text) {}
 
 SearchResult::Action::~Action() {}
 
 SearchResult::SearchResult()
     : relevance_(0),
       display_type_(DISPLAY_LIST),
       voice_result_(false),
       is_installing_(false),
-      percent_downloaded_(0) {
+      percent_downloaded_(0),
+      distance_from_origin_(-1) {
 }
 
 SearchResult::~SearchResult() {
   FOR_EACH_OBSERVER(SearchResultObserver, observers_, OnResultDestroying());
 }
 
 void SearchResult::SetIcon(const gfx::ImageSkia& icon) {
   icon_ = icon;
   FOR_EACH_OBSERVER(SearchResultObserver,
                     observers_,
@@ skipping 59 matching lines @@
 }
 
 void SearchResult::InvokeAction(int action_index, int event_flags) {
 }
 
 ui::MenuModel* SearchResult::GetContextMenuModel() {
   return NULL;
 }
 
 }  // namespace app_list