Reland: Ntp: restore scroll position.

content/browser/frame_host/navigation_controller_android.h

Index: content/browser/frame_host/navigation_controller_android.h
diff --git a/content/browser/frame_host/navigation_controller_android.h b/content/browser/frame_host/navigation_controller_android.h
index fda06549e397f1e0c601e30321277e87f63888ba..69b7e191ab4cbb35566cc2d1f916e1f513129983 100644
--- a/content/browser/frame_host/navigation_controller_android.h
+++ b/content/browser/frame_host/navigation_controller_android.h
@@ -135,6 +135,16 @@ class CONTENT_EXPORT NavigationControllerAndroid {
                              const base::android::JavaParamRef<jobject>& obj,
                              jlong source_native_navigation_controller_android,
                              jboolean replace_entry);
+  base::android::ScopedJavaLocalRef<jstring> GetEntryExtraData(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj,
+      jint index,
+      const base::android::JavaParamRef<jstring>& jkey);
+  void SetEntryExtraData(JNIEnv* env,
+                         const base::android::JavaParamRef<jobject>& obj,
+                         jint index,
+                         const base::android::JavaParamRef<jstring>& jkey,
+                         const base::android::JavaParamRef<jstring>& jvalue);
 
  private:
   NavigationControllerImpl* navigation_controller_;