Add UMA histograms for home page, start page, and DSE hosts.

chrome/browser/search_engines/prepopulated_engines.json

 // 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.
 
 // This file is used during build to generate prepopulated_engine.h/cc.
 // For more details see tools/json_to_struct/json_to_struct.py.
 
 // Engine definitions. See prepopulated_engines_schema.json for the field
 // definitions.
 
 // The following unique IDs are available:
 //    53, 56, 58, 60, 61, 64, 65, 66, 70, 74, 78, 79, 80, 81, 84, 86, 88, 91,
-//    92, 93, 94, 95, 96, 97, 98, 99, 102+
+//    92, 93, 94, 95, 96, 97, 98, 99, 115+
 //
 // IDs > 1000 are reserved for distribution custom engines.
 //
 // NOTES:
 //   - CHANGE THE ABOVE NUMBERS IF YOU ADD A NEW ENGINE; ID conflicts = bad!
 //   - Make sure you update the int_variables below as required.
 
 {
   "int_variables": {
     // The following id is for UMA stats only. Please update it if you add new
     // engines outside the current range or it will not be counted in stats.
-    "kMaxPrepopulatedEngineID": 101,
+    "kMaxPrepopulatedEngineID": 114,
 
     // Increment this if you change the data in ways that mean users with
     // existing data should get a new version.
     "kCurrentDataVersion": 57
   },
 
   // The following engines are included in country lists and are added to the
   // list of search engines on the first run depending on user's country.
   "elements": {
     "abcsok": {
@@ skipping 1682 matching lines @@
       "name": "Yandex",
       "keyword": "yandex.com.tr",
       "favicon_url": "http://yandex.com.tr/favicon.ico",
       "search_url": "http://yandex.com.tr/yandsearch?text={searchTerms}",
       "suggest_url": "http://suggest.yandex.net/suggest-ff.cgi?part={searchTerms}",
       "type": "SEARCH_ENGINE_YANDEX",
       "id": 15
     }
   }
 }