Add NewTabPageRecyclerViewTest.

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
index 7be3f766f6e694477fb6e8d573e052de63c3e347..6798afae57e1ca9c516ad748bd95ab77f668cf31 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.java
@@ -112,6 +112,7 @@ public class NewTabPage
             "https://www.googleapis.com/auth/chrome-content-suggestions";
 
     private static MostVisitedSites sMostVisitedSitesForTests;
+    private static SuggestionsSource sSuggestionsSourceForTests;
 
     private final Tab mTab;
     private final TabModelSelector mTabModelSelector;
@@ -217,10 +218,15 @@ public class NewTabPage
     }
 
     @VisibleForTesting
-    static void setMostVisitedSitesForTests(MostVisitedSites mostVisitedSitesForTests) {
+    public static void setMostVisitedSitesForTests(MostVisitedSites mostVisitedSitesForTests) {
         sMostVisitedSitesForTests = mostVisitedSitesForTests;
     }
 
+    @VisibleForTesting
+    public static void setSuggestionsSourceForTests(SuggestionsSource suggestionsSource) {
+        sSuggestionsSourceForTests = suggestionsSource;
+    }
+
     private final NewTabPageManager mNewTabPageManager = new NewTabPageManager() {
         private static final String NTP_OFFLINE_PAGES_FEATURE_NAME = "NTPOfflinePages";
 
@@ -653,6 +659,7 @@ public class NewTabPage
 
         @Override
         public SuggestionsSource getSuggestionsSource() {
+            if (sSuggestionsSourceForTests != null) return sSuggestionsSourceForTests;
             return mSnippetsBridge;
         }
 
@@ -777,7 +784,7 @@ public class NewTabPage
 
     /** @return The view container for the new tab page. */
     @VisibleForTesting
-    NewTabPageView getNewTabPageView() {
+    public NewTabPageView getNewTabPageView() {
         return mNewTabPageView;
     }