Add search_terms_replacement_key field to TemplateURL.

chrome/browser/search_engines/prepopulated_engines_schema.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 by json_to_struct.py to generate prepopulated_engine.h/cc.
 // Any time you modify this file regenerate the .h/.cc. See
 // prepopulated_engines.json for details.
 
 {
   "type_name": "PrepopulatedEngine",
   "headers": [
     "chrome/browser/search_engines/search_engine_type.h"
   ],
   "schema": [
     { "field": "name", "type": "string16" },
     { "field": "keyword", "type": "string16" },
     { "field": "favicon_url", "type": "string" },
     { "field": "search_url", "type": "string" },
     {
       "field": "encoding",
       "type": "string",
       "default": "UTF-8",
       "optional": true
     },
     // If omitted, this engine does not support suggestions.
-    { "field": "suggest_url", "type": "string", "optional": true  },
+    { "field": "suggest_url", "type": "string", "optional": true },
     // If omitted, this engine does not support instant.
-    { "field": "instant_url", "type": "string", "optional": true  },
+    { "field": "instant_url", "type": "string", "optional": true },
     // A list of URL patterns that can be used, in addition to |search_url|,
     // to extract search terms from a URL.
     {
       "field": "alternate_urls",
       "type": "array",
       "contents": { "type": "string" },
       "optional": true
     },
+    // A parameter that, if present in the query or ref parameters of a
+    // search_url or instant_url, causes Chrome to replace the URL with the
+    // search term.
+    {
+      "field": "search_terms_replacement_key",
+      "type": "string",
+      "optional": true
+    },
     {
       "field": "type",
       "type": "enum",
       "ctype": "SearchEngineType",
       "default": "SEARCH_ENGINE_OTHER",
       "optional": true
     },
     // Unique id for this prepopulate engine (corresponds to
     // TemplateURL::prepopulate_id). This ID must be greater than zero and must
     // remain the same for a particular site regardless of how the url changes;
     // the ID is used when modifying engine data in subsequent versions, so that
     // we can find the "old" entry to update even when the name or URL changes.
     //
     // This ID must be "unique" within one country's prepopulated data, but two
     // entries can share an ID if they represent the "same" engine (e.g. Yahoo!
     // US vs. Yahoo! UK) and will not appear in the same user-visible data set.
     // This facilitates changes like adding more specific per-country data in
     // the future; in such a case the localized engines will transparently
     // replace the previous, non-localized versions.  For engines where we need
     // two instances to appear for one country (e.g. Bing Search U.S. English
     // and Spanish), we must use two different unique IDs (and different
     // keywords).
     //
     // See prepopulated_engines.json for the list of available IDs.
     { "field": "id", "type": "int" }
   ]
 }