Add component for feature engagement tracking.

components/feature_engagement_tracker/internal/android/feature_engagement_tracker_jni_registrar.cc

+// Copyright 2017 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.
+
+#include "components/feature_engagement_tracker/public/android/feature_engagement_tracker_jni_registrar.h"
+
+#include "base/android/jni_registrar.h"
+#include "components/feature_engagement_tracker/internal/android/feature_engagement_tracker_impl_android.h"
+
+namespace feature_engagement_tracker {
+namespace {
+base::android::RegistrationMethod
+    kFeatureEngagementTrackerRegistrationMethods[] = {
+        {"FeatureEngagementTrackerImplAndroid",
+         FeatureEngagementTrackerImplAndroid::RegisterJni},
+};
+}  // namespace
+
+// This method is declared in //components/feature_engagement_tracker/public/
+//     android/feature_engagement_tracker_jni_registrar.h,
+// and should be linked in to any binary that calls
+// feature_engagement_tracker::RegisterFeatureEngagementTrackerJni.
+bool RegisterFeatureEngagementTrackerJni(JNIEnv* env) {
+  return base::android::RegisterNativeMethods(
+      env, kFeatureEngagementTrackerRegistrationMethods,
+      arraysize(kFeatureEngagementTrackerRegistrationMethods));
+}
+
+}  // namespace feature_engagement_tracker