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

chrome/browser/autocomplete/keyword_provider.cc

Index: chrome/browser/autocomplete/keyword_provider.cc
diff --git a/chrome/browser/autocomplete/keyword_provider.cc b/chrome/browser/autocomplete/keyword_provider.cc
index 6a8cc4255f313171d602335f070df7fcc049efc4..b50711a2e9999c50e374903b4cebe41d94f5cc5e 100644
--- a/chrome/browser/autocomplete/keyword_provider.cc
+++ b/chrome/browser/autocomplete/keyword_provider.cc
@@ -319,6 +319,7 @@ string16 KeywordProvider::SplitKeywordFromInput(
 
 // static
 void KeywordProvider::FillInURLAndContents(
+    Profile* profile,
     const string16& remaining_input,
     const TemplateURL* element,
     AutocompleteMatch* match) {
@@ -355,7 +356,7 @@ void KeywordProvider::FillInURLAndContents(
     // fixup to make the URL valid if necessary.
     DCHECK(element->url()->SupportsReplacement());
     match->destination_url = GURL(element->url()->ReplaceSearchTerms(
-        *element, remaining_input,
+        profile, *element, remaining_input,
         TemplateURLRef::NO_SUGGESTIONS_AVAILABLE, string16()));
     std::vector<size_t> content_param_offsets;
     match->contents.assign(l10n_util::GetStringFUTF16(message_id,
@@ -430,7 +431,7 @@ AutocompleteMatch KeywordProvider::CreateAutocompleteMatch(
 
   // Create destination URL and popup entry content by substituting user input
   // into keyword templates.
-  FillInURLAndContents(remaining_input, element, &result);
+  FillInURLAndContents(profile_, remaining_input, element, &result);
 
   if (supports_replacement)
     result.template_url = element;