Add component for feature engagement tracking.

chrome/browser/android/feature_engagement_tracker/feature_engagement_tracker_factory_android.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 "chrome/browser/android/feature_engagement_tracker/feature_engagement_tracker_factory_android.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/scoped_java_ref.h"
+#include "chrome/browser/feature_engagement_tracker/feature_engagement_tracker_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_android.h"
+#include "components/feature_engagement_tracker/public/feature_engagement_tracker.h"
+#include "jni/FeatureEngagementTrackerFactory_jni.h"
+
+static base::android::ScopedJavaLocalRef<jobject>
+GetFeatureEngagementTrackerForProfile(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jclass>& clazz,
+    const base::android::JavaParamRef<jobject>& jprofile) {
+  Profile* profile = ProfileAndroid::FromProfileAndroid(jprofile);
+  DCHECK(profile);
+  return feature_engagement_tracker::FeatureEngagementTracker::GetJavaObject(
+      FeatureEngagementTrackerFactory::GetInstance()->GetForBrowserContext(
+          profile));
+}
+
+bool RegisterFeatureEngagementTrackerFactoryJni(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}