IPH - Added triggers for Download page

components/feature_engagement_tracker/public/android/java/src/org/chromium/components/feature_engagement_tracker/FeatureConstants.java

 // 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.
 
 package org.chromium.components.feature_engagement_tracker;
 
 /**
  * FeatureConstants contains the String name of all base::Feature in-product help features declared
  * in //components/feature_engagement_tracker/public/feature_constants.h.
  */
 public final class FeatureConstants {
-    public static final String DUMMY_FEATURE = "IPH_DummyFeature";
+    public static final String DOWNLOAD_PAGE_FEATURE = "IPH_DownloadPage";
 
     /**
      * Do not instantiate.
      */
     private FeatureConstants() {}
 }