Tentative fix for scroll event related crashes on the NTP

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 e9354ec17305f271b238ae24c4afe5433f484b20..dbdf31da01aee4fb232b732cb839c23e26c18f20 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
@@ -199,6 +199,11 @@
          *                   just tapped the fakebox.
          */
         void requestUrlFocusFromFakebox(String pastedText);
+
+        /**
+         * @return whether the provided native page is the one currently displayed to the user.
+         */
+        boolean isCurrentPage(NativePage nativePage);
     }
 
     /**
@@ -661,6 +666,13 @@ public void registerSignInStateObserver(SignInStateObserver signInStateObserver)
             mSignInStateObserver = signInStateObserver;
             SigninManager.get(mActivity).addSignInStateObserver(mSignInStateObserver);
         }
+
+        @Override
+        public boolean isCurrentPage() {
+            if (mIsDestroyed) return false;
+            if (mFakeboxDelegate == null) return false;
+            return mFakeboxDelegate.isCurrentPage(NewTabPage.this);
+        }
     };
 
     /**