📰 Tweak the suggestion ranks for UMA to handle fetchMore

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SuggestionsSource.java

 // Copyright 2016 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.chrome.browser.ntp.snippets;
 
 import android.graphics.Bitmap;
 
 import org.chromium.base.Callback;
 import org.chromium.chrome.browser.ntp.cards.SuggestionsCategoryInfo;
 import org.chromium.chrome.browser.ntp.snippets.CategoryStatus.CategoryStatusEnum;
+import org.chromium.chrome.browser.suggestions.SuggestionsUma;
 
 import java.util.List;
 
 /**
  * An interface for classes that provide content suggestions.
  */
 public interface SuggestionsSource {
     /**
      * An observer for events in the content suggestions service.
      */
@@ skipping 69 matching lines @@
      * Tells the source to dismiss the category.
      */
     void dismissCategory(@CategoryInt int category);
 
     /**
      * Restores all categories previously dismissed with {@link #dismissCategory}.
      */
     void restoreDismissedCategories();
 
     /**
-     * Sets the recipient for update events from the source.
+     * Finishes initialisation of the suggestions source, pairing it with an observer.
+     * @param observer object to notify when snippets are received.
+     * @param umaHelper object used to obtain metrics-related data.
      */
-    void setObserver(Observer observer);
+    void init(Observer observer, SuggestionsUma umaHelper);
 }