📰 Tweak the suggestion ranks for UMA to handle fetchMore

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SuggestionsSource.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SuggestionsSource.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SuggestionsSource.java
index 073147059a8ed649918b63bee512cfe476f0b4c0..0a2486f07b78361ac336f9293130199d36a809f5 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SuggestionsSource.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SuggestionsSource.java
@@ -9,6 +9,7 @@
 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;
 
@@ -98,7 +99,9 @@
     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);
 }