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

components/variations/service/variations_service_client.h

Index: components/variations/service/variations_service_client.h
diff --git a/components/variations/service/variations_service_client.h b/components/variations/service/variations_service_client.h
index b3758a64b37bdd3eaf3509b0f0b5ce49214e3f9f..a89e694d3823f2f71032ddf69b2d756258e133cb 100644
--- a/components/variations/service/variations_service_client.h
+++ b/components/variations/service/variations_service_client.h
@@ -59,6 +59,11 @@ class VariationsServiceClient {
 
   // Called from VariationsService::PerformPreMainMessageLoopStartup().
   virtual void OnInitialStartup() {}
+
+#if defined(OS_ANDROID)
+  virtual base::Callback<std::string(const std::string&)>
+    GetPullVariationsSeedCallback() = 0;
+#endif  // OS_ANDROID
 };
 
 }  // namespace variations