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

chrome/browser/metrics/variations/chrome_variations_service_client.cc

Index: chrome/browser/metrics/variations/chrome_variations_service_client.cc
diff --git a/chrome/browser/metrics/variations/chrome_variations_service_client.cc b/chrome/browser/metrics/variations/chrome_variations_service_client.cc
index ed7ceffdba0e273151e35caf42758040de6e4853..8e6b4beed40e2c4807297bd276cd7b134d2459e9 100644
--- a/chrome/browser/metrics/variations/chrome_variations_service_client.cc
+++ b/chrome/browser/metrics/variations/chrome_variations_service_client.cc
@@ -10,6 +10,10 @@
 #include "components/version_info/version_info.h"
 #include "content/public/browser/browser_thread.h"
 
+#if defined(OS_ANDROID)
+#include "chrome/browser/android/preferences/pref_service_bridge.h"
+#endif  // OS_ANDROID
+
 #if !defined(OS_ANDROID) && !defined(OS_IOS) && !defined(OS_CHROMEOS)
 #include "chrome/browser/upgrade_detector_impl.h"
 #endif
@@ -79,6 +83,15 @@ bool ChromeVariationsServiceClient::OverridesRestrictParameter(
 #endif
 }
 
+variations::VariationsFirstRunSeedCallback
+ChromeVariationsServiceClient::GetVariationsFirstRunSeedCallback() {
+#if defined(OS_ANDROID)
+  return base::Bind(&PrefServiceBridge::GetVariationsFirstRunSeed);
+#else   // OS_ANDROID
+  return variations::VariationsFirstRunSeedCallback();
+#endif  // OS_ANDROID
+}
+
 void ChromeVariationsServiceClient::OnInitialStartup() {
 #if defined(OS_WIN)
   StartGoogleUpdateRegistrySync();