Add other variations (with ids) for NTPSnippets to chrome://flags

components/variations/variations_http_header_provider.h

Index: components/variations/variations_http_header_provider.h
diff --git a/components/variations/variations_http_header_provider.h b/components/variations/variations_http_header_provider.h
index b92daca3a549a66626793d67aeca3a0a2012ed33..32aea0c5127b7c76737b019a10baa8dbc11d26ca 100644
--- a/components/variations/variations_http_header_provider.h
+++ b/components/variations/variations_http_header_provider.h
@@ -42,11 +42,11 @@ class VariationsHttpHeaderProvider : public base::FieldTrialList::Observer,
   std::string GetVariationsString();
 
   // Sets *additional* variation ids and trigger variation ids to be encoded in
-  // the X-Client-Data request header.  This is intended for development use to
-  // force a server side experiment id.  |variation_ids| should be a
-  // comma-separated string of numeric experiment ids.  If an id is prefixed
-  // with "t" it will be treated as a trigger experiment id.
-  bool SetDefaultVariationIds(const std::string& variation_ids);
+  // the X-Client-Data request header. This is intended for development use to
+  // force a server side experiment id. |variation_ids| should be a list of
+  // strings of numeric experiment ids. If an id is prefixed with "t" it will
+  // be treated as a trigger experiment id.
+  bool SetDefaultVariationIds(const std::vector<std::string>& variation_ids);
 
   // Resets any cached state for tests.
   void ResetForTesting();