Unit tests for importing prefs from the Java side implemented

components/variations/BUILD.gn

 # 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.
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 source_set("variations") {
   sources = [
@@ skipping 44 matching lines @@
   ]
 
   if (is_android || is_ios) {
     sources += [
       "variations_request_scheduler_mobile.cc",
       "variations_request_scheduler_mobile.h",
     ]
   }
 
   deps = [
-    "proto",
     "//base",
     "//base:prefs",
     "//components/compression",
     "//components/crash/core/common",
     "//crypto",
     "//third_party/mt19937ar",
     "//third_party/protobuf:protobuf_lite",
+    "proto",
   ]
 
   if (is_android) {
     deps += [ ":jni" ]
   }
 }
 
 if (is_android) {
   # GYP: //components/variations.gypi:variations_jni_headers
   generate_jni("jni") {
     sources = [
       "android/java/src/org/chromium/components/variations/VariationsAssociatedData.java",
       "android/java/src/org/chromium/components/variations/firstrun/VariationsSeedBridge.java",
     ]
     jni_package = "variations"
   }
 }
 
+if (is_android) {
+  generate_jni("variations_jni_test_headers") {
+    sources = [
+      "android/java/src/org/chromium/components/variations/firstrun/VariationsSeedBridgeTest.java",
+    ]
+    jni_package = "variations"
+  }
+}
+
 source_set("unit_tests") {
   testonly = true
   sources = [
     "active_field_trials_unittest.cc",
     "caching_permuted_entropy_provider_unittest.cc",
     "entropy_provider_unittest.cc",
     "experiment_labels_unittest.cc",
     "metrics_util_unittest.cc",
     "net/variations_http_header_provider_unittest.cc",
     "study_filtering_unittest.cc",
     "variations_associated_data_unittest.cc",
     "variations_request_scheduler_unittest.cc",
     "variations_seed_processor_unittest.cc",
     "variations_seed_simulator_unittest.cc",
     "variations_seed_store_unittest.cc",
   ]
 
   if (is_android || is_ios) {
     sources += [ "variations_request_scheduler_mobile_unittest.cc" ]
   }
 
+  if (is_android) {
+    sources += [
+      "android/variations_seed_bridge_test.cc",
+      "android/variations_seed_bridge_test.h",
+    ]
+  }
+
   deps = [
     ":variations",
-    "net",
-    "proto",
+    ":variations_jni_test_headers",
     "//base:prefs_test_support",
     "//base/test:test_support",
     "//components/compression",
     "//testing/gtest",
+    "net",
+    "proto",
   ]
 }