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

chrome/browser/android/preferences/pref_service_bridge.h

 // Copyright 2014 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 CHROME_BROWSER_ANDROID_PREFERENCES_PREF_SERVICE_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_PREFERENCES_PREF_SERVICE_BRIDGE_H_
 
 #include <jni.h>
 #include <string>
 
 #include "components/content_settings/core/common/content_settings.h"
 
 class PrefServiceBridge {
  public:
   static bool RegisterPrefServiceBridge(JNIEnv* env);
 
   // Use |locale| to create a language-region pair and language code to prepend
   // to the default accept languages. For Malay, we'll end up creating
   // "ms-MY,ms,en-US,en", and for Swiss-German, we will have
   // "de-CH,de-DE,de,en-US,en".
   static void PrependToAcceptLanguagesIfNecessary(
       const std::string& locale,
       std::string* accept_languages);
 
   // Return the corresponding Android permission associated with the
   // ContentSettingsType specified (or an empty string if no permission exists).
   static std::string GetAndroidPermissionForContentSetting(
       ContentSettingsType content_type);
+
+  // Return the first run seed data pulled from the Java side of application.
+  static void GetVariationsFirstRunSeed(std::string* seed_data,
+                                        std::string* seed_signature,
+                                        std::string* seed_country);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_PREFERENCES_PREF_SERVICE_BRIDGE_H_