IPH - Added triggers for Download page

components/feature_engagement_tracker/public/android/java/src/org/chromium/components/feature_engagement_tracker/EventConstants.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;
+
+/**
+ * EventConstants contains the String name of all in-product help events.
+ */
+public final class EventConstants {
+    /**
+     * The page load has failed and user has landed on an offline dino page.
+     */
+    public static final String USER_HAS_SEEN_DINO = "user_has_seen_dino";
+
+    /**
+     * The user has started downloading a page.
+     */
+    public static final String DOWNLOAD_PAGE_STARTED = "download_page_started";
+
+    /**
+     * Do not instantiate.
+     */
+    private EventConstants() {}
+}