Variations seed is pulled from the Java application on the first launch of Chrome

components/variations/service/variations_service_client.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_VARIATIONS_SERVICE_VARIATIONS_SERVICE_CLIENT_H_
 #define COMPONENTS_VARIATIONS_SERVICE_VARIATIONS_SERVICE_CLIENT_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "base/version.h"
+#include "components/variations/variations_seed_store.h"
 #include "components/version_info/version_info.h"
 
 namespace base {
 class SequencedWorkerPool;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
@@ skipping 29 matching lines @@
   // Gets the channel of the embedder.
   virtual version_info::Channel GetChannel() = 0;
 
   // Returns whether the embedder overrides the value of the restrict parameter.
   // |parameter| is an out-param that will contain the value of the restrict
   // parameter if true is returned.
   virtual bool OverridesRestrictParameter(std::string* parameter) = 0;
 
   // Called from VariationsService::PerformPreMainMessageLoopStartup().
   virtual void OnInitialStartup() {}
+
+  // Get callback for pulling variations first run seed from Java applicaton
+  // in Chrome for Android.
+  virtual VariationsFirstRunSeedCallback GetVariationsFirstRunSeedCallback();
 };
 
 }  // namespace variations
 
 #endif  // COMPONENTS_VARIATIONS_SERVICE_VARIATIONS_SERVICE_CLIENT_H_