Add Yandex referral ID to search URL.

chrome/browser/search_engines/ui_thread_search_terms_data.h

Index: chrome/browser/search_engines/ui_thread_search_terms_data.h
diff --git a/chrome/browser/search_engines/ui_thread_search_terms_data.h b/chrome/browser/search_engines/ui_thread_search_terms_data.h
index 78e4b7df441424927a5f1e91037b21a89c14fd52..4482d185fa2647b727179ec7f7f9da62d971c592 100644
--- a/chrome/browser/search_engines/ui_thread_search_terms_data.h
+++ b/chrome/browser/search_engines/ui_thread_search_terms_data.h
@@ -31,6 +31,10 @@ class UIThreadSearchTermsData : public SearchTermsData {
   std::string ForceInstantResultsParam(bool for_prerender) const override;
   std::string GoogleImageSearchSource() const override;
 
+#if defined(OS_ANDROID)
+  std::string YandexReferralID() const override;
+#endif
+
   // Used by tests to override the value for the Google base URL.  Passing the
   // empty string cancels this override.
   static void SetGoogleBaseURL(const std::string& base_url);