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

components/variations/variations_seed_store.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 COMPONENTS_VARIATIONS_VARIATIONS_SEED_STORE_H_
 #define COMPONENTS_VARIATIONS_VARIATIONS_SEED_STORE_H_
 
 #include <string>
 
+#include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/time/time.h"
 
 class PrefService;
 class PrefRegistrySimple;
 
 namespace variations {
 class VariationsSeed;
 }
@@ skipping 48 matching lines @@
     return seed_has_country_code_;
   }
 
   // Returns the invalid signature in base64 format, or an empty string if the
   // signature was valid, missing, or if signature verification is disabled.
   std::string GetInvalidSignature() const;
 
   // Registers Local State prefs used by this class.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
+#if defined(OS_ANDROID)
+  void SetPullVariationsSeedCallback(
+      const base::Callback<std::string(const std::string&)>& callback) {
+    pull_variations_seed_pref_ = callback;
+  }
+#endif  // OS_ANDROID
+
  protected:
   // Note: UMA histogram enum - don't re-order or remove entries.
   enum VerifySignatureResult {
     VARIATIONS_SEED_SIGNATURE_MISSING,
     VARIATIONS_SEED_SIGNATURE_DECODE_FAILED,
     VARIATIONS_SEED_SIGNATURE_INVALID_SIGNATURE,
     VARIATIONS_SEED_SIGNATURE_INVALID_SEED,
     VARIATIONS_SEED_SIGNATURE_VALID,
     VARIATIONS_SEED_SIGNATURE_ENUM_SIZE,
   };
@@ skipping 39 matching lines @@
   // Cached serial number from the most recently fetched variations seed.
   std::string variations_serial_number_;
 
   // Whether the most recently fetched variations seed has the country code
   // field set.
   bool seed_has_country_code_;
 
   // Keeps track of an invalid signature.
   std::string invalid_base64_signature_;
 
+  base::Callback<std::string(const std::string&)> pull_variations_seed_pref_;
+
   DISALLOW_COPY_AND_ASSIGN(VariationsSeedStore);
 };
 
 }  // namespace variations
 
 #endif  // COMPONENTS_VARIATIONS_VARIATIONS_SEED_STORE_H_