📰 Show the Sign In promo as a separate card from the section

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
index 8a382e396a77b1dd0cea842a173a1cfee82fd10c..73af7d9ae8fc8435d5703c2bacfe4d3db70574a7 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
@@ -55,6 +55,7 @@
 import org.chromium.chrome.browser.ntp.snippets.SnippetsConfig;
 import org.chromium.chrome.browser.ntp.snippets.SuggestionsSource;
 import org.chromium.chrome.browser.profiles.MostVisitedSites.MostVisitedURLsObserver;
+import org.chromium.chrome.browser.signin.SigninManager.SignInStateObserver;
 import org.chromium.chrome.browser.util.MathUtils;
 import org.chromium.chrome.browser.util.ViewUtils;
 import org.chromium.chrome.browser.widget.RoundedIconGenerator;
@@ -291,6 +292,12 @@ void ensureIconIsAvailable(String pageUrl, String iconUrl, boolean isLargeIcon,
          * instead of keeping your own reference.
          */
         @Nullable SuggestionsSource getSuggestionsSource();
+
+        /**
+         * Registers a {@link SignInStateObserver}, will handle the de-registration when the New Tab
+         * Page goes away.
+         */
+        void registerSignInStateObserver(SignInStateObserver signInStateObserver);
     }
 
     /**