Adds InstantExtendedEnabledParam to the search request URL iff the query extraction flag is enabled.

chrome/browser/search/search.cc

Index: chrome/browser/search/search.cc
diff --git a/chrome/browser/search/search.cc b/chrome/browser/search/search.cc
index 16e74fadbe60a34e4277a101aaebf91c07df5119..09a841a495efa0fa0cbb55440e8fe1653b15d063 100644
--- a/chrome/browser/search/search.cc
+++ b/chrome/browser/search/search.cc
@@ -364,6 +364,13 @@ uint64 EmbeddedSearchPageVersion() {
   return kEmbeddedPageVersionDefault;
 }
 
+std::string InstantExtendedEnabledParam(bool for_search) {
+  if (for_search && !chrome::IsQueryExtractionEnabled())
+    return std::string();
+  return std::string(google_util::kInstantExtendedAPIParam) + "=" +
+      base::Uint64ToString(EmbeddedSearchPageVersion()) + "&";
+}
+
 bool IsQueryExtractionEnabled() {
 #if defined(OS_IOS) || defined(OS_ANDROID)
   return true;