Add NewTabPageRecyclerViewTest.

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
index 708c3b82cc23fe4084bd307f610d8fe3c53c0f7d..19719296650123cf8053cfd7d5b1645ec7de3745 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
@@ -384,6 +384,10 @@ public class NewTabPageAdapter
         return RecyclerView.NO_POSITION;
     }
 
+    public int getSignInPromoPosition() {
+        return getChildPositionOffset(mSigninPromo);
+    }
+
     public int getBottomSpacerPosition() {
         return getChildPositionOffset(mBottomSpacer);
     }
@@ -567,7 +571,8 @@ public class NewTabPageAdapter
         return mRecyclerView.findViewHolderForAdapterPosition(siblingPosDelta + swipePos);
     }
 
-    private boolean hasAllBeenDismissed() {
+    @VisibleForTesting
+    public boolean hasAllBeenDismissed() {
         return mSections.isEmpty() && !mSigninPromo.isVisible();
     }