Add a URL param to indicate group selection in Instant field trial.

chrome/browser/search_engines/search_host_to_urls_map.h

Index: chrome/browser/search_engines/search_host_to_urls_map.h
diff --git a/chrome/browser/search_engines/search_host_to_urls_map.h b/chrome/browser/search_engines/search_host_to_urls_map.h
index e4692fbd381e59b69b586ec625f5863c78551f89..a365a87fb9074eb858ab9d09b7d8ec63ec051427 100644
--- a/chrome/browser/search_engines/search_host_to_urls_map.h
+++ b/chrome/browser/search_engines/search_host_to_urls_map.h
@@ -13,6 +13,7 @@
 
 #include "base/basictypes.h"
 
+class Profile;
 class SearchTermsData;
 class TemplateURL;
 
@@ -36,14 +37,15 @@ class SearchHostToURLsMap {
            const SearchTermsData& search_terms_data);
 
   // Removes the TemplateURL from the lookup.
-  void Remove(const TemplateURL* template_url);
+  void Remove(const TemplateURL* template_url, Profile* profile);
 
   // Updates information in an existing TemplateURL. Note: Using Remove and
   // then Add separately would lead to race conditions in reading because the
   // lock would be released inbetween the calls.
   void Update(const TemplateURL* existing_turl,
               const TemplateURL& new_values,
-              const SearchTermsData& search_terms_data);
+              const SearchTermsData& search_terms_data,
+              Profile* profile);
 
   // Updates all search providers which have a google base url.
   void UpdateGoogleBaseURLs(const SearchTermsData& search_terms_data);