Unit tests for importing prefs from the Java side implemented

components/variations/android/variations_seed_bridge.h

Index: components/variations/android/variations_seed_bridge.h
diff --git a/components/variations/android/variations_seed_bridge.h b/components/variations/android/variations_seed_bridge.h
index 63ce5e2fcc43be810f963d72522db91f75a0c1e9..85e633f77366d06b7ed11e5eb67897783d42f31e 100644
--- a/components/variations/android/variations_seed_bridge.h
+++ b/components/variations/android/variations_seed_bridge.h
@@ -28,6 +28,15 @@ void ClearJavaFirstRunPrefs();
 // the Java side.
 void MarkVariationsSeedAsStored();
 
+// Sets test data on the Java side. The data is pulled during the unit tests to
+// C++ side and is being checked for consistency.
+// This method is used for unit testing purposes only.
+void SetJavaFirstRunPrefsForTesting(const std::string& seed_data,
+                                    const std::string& seed_signature,
+                                    const std::string& seed_country,
+                                    const std::string& response_date,
+                                    bool is_gzip_compressed);
+
 }  // namespace android
 }  // namespace variations