Add validateOrigin() to the support library.

customtabs/tests/src/android/support/customtabs/TestCustomTabsCallback.java

Index: customtabs/tests/src/android/support/customtabs/TestCustomTabsCallback.java
diff --git a/customtabs/tests/src/android/support/customtabs/TestCustomTabsCallback.java b/customtabs/tests/src/android/support/customtabs/TestCustomTabsCallback.java
index 56b181787bd52af89fb9ead986044b835fc42f5f..804d354713b3e49cc16b99f921dd44387fdcc451 100644
--- a/customtabs/tests/src/android/support/customtabs/TestCustomTabsCallback.java
+++ b/customtabs/tests/src/android/support/customtabs/TestCustomTabsCallback.java
@@ -16,6 +16,7 @@
 
 package android.support.customtabs;
 
+import android.net.Uri;
 import android.os.Bundle;
 import android.os.RemoteException;
 
@@ -50,6 +51,13 @@ public class TestCustomTabsCallback extends CustomTabsCallback {
                 throws RemoteException {
             TestCustomTabsCallback.this.onPostMessage(message, extras);
         }
+
+        @Override
+        public void onRelationshipValidationResult(int relation, Uri origin, boolean result,
+                                                   Bundle extras) throws RemoteException {
+            TestCustomTabsCallback.this.onRelationshipValidationResult(
+                    relation, origin, result, extras);
+        }
     };
 
     /* package */ ICustomTabsCallback getStub() {