Fix GN toolchains to use proper out dir.

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")
+}
+
 static_library("variations") {
   sources = [
     "active_field_trials.cc",
     "active_field_trials.h",
     "android/component_jni_registrar.cc",
     "android/component_jni_registrar.h",
     "android/variations_associated_data_android.cc",
     "android/variations_associated_data_android.h",
     "caching_permuted_entropy_provider.cc",
     "caching_permuted_entropy_provider.h",
@@ skipping 19 matching lines @@
     "variations_seed_processor.h",
     "variations_seed_simulator.cc",
     "variations_seed_simulator.h",
   ]
 
   deps = [
     "//base",
     "//components/variations/proto",
     "//third_party/mt19937ar",
   ]
+
+  if (is_android) {
+    deps += [ ":jni" ]
+  }
 }
+
+if (is_android) {
+  generate_jni("jni") {
+    sources = [
+      "android/java/src/org/chromium/components/variations/VariationsAssociatedData.java",
+    ]
+    jni_package = "variations"
+  }
+}