Update for ViewPager changes

Change-Id: I186fe998b05b37d178ed07633597692900c6d238
diff --git a/samples/Support4Demos/src/com/example/android/supportv4/app/FragmentTabsPager.java b/samples/Support4Demos/src/com/example/android/supportv4/app/FragmentTabsPager.java
index 6db9d3c..75498fd 100644
--- a/samples/Support4Demos/src/com/example/android/supportv4/app/FragmentTabsPager.java
+++ b/samples/Support4Demos/src/com/example/android/supportv4/app/FragmentTabsPager.java
@@ -15,8 +15,6 @@
  */
 package com.example.android.supportv4.app;
 
-import java.util.ArrayList;
-
 import com.example.android.supportv4.R;
 
 import android.content.Context;
@@ -28,6 +26,8 @@
 import android.view.View;
 import android.widget.TabHost;
 
+import java.util.ArrayList;
+
 /**
  * Demonstrates combining a TabHost with a ViewPager to implement a tab UI
  * that switches between tabs and also allows the user to perform horizontal
@@ -161,5 +161,9 @@
         public void onPageSelected(int position) {
             mTabHost.setCurrentTab(position);
         }
+
+        @Override
+        public void onPageScrollStateChanged(int state) {
+        }
     }
 }