Add search_terms_replacement_key field to TemplateURL.

chrome/browser/search_engines/template_url.h

Index: chrome/browser/search_engines/template_url.h
diff --git a/chrome/browser/search_engines/template_url.h b/chrome/browser/search_engines/template_url.h
index 6fba137da66816fb4c5a162cfa714bbdfebd6b68..b5a357669fbc38e8e8a0d897eca9bad85f5ff3c0 100644
--- a/chrome/browser/search_engines/template_url.h
+++ b/chrome/browser/search_engines/template_url.h
@@ -352,6 +352,10 @@ struct TemplateURLData {
   // search terms from a URL.
   std::vector<std::string> alternate_urls;
 
+  // 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.
+  std::string search_terms_replacement_key;
+
  private:
   // Private so we can enforce using the setters and thus enforce that these
   // fields are never empty.
@@ -427,6 +431,10 @@ class TemplateURL {
 
   const std::string& sync_guid() const { return data_.sync_guid; }
 
+  const std::string& search_terms_replacement_key() const {
+    return data_.search_terms_replacement_key;
+  }
+
   const TemplateURLRef& url_ref() const { return url_ref_; }
   const TemplateURLRef& suggestions_url_ref() const {
     return suggestions_url_ref_;