Add validateOrigin() to the support library.

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

Index: customtabs/tests/src/android/support/customtabs/TestCustomTabsService.java
diff --git a/customtabs/tests/src/android/support/customtabs/TestCustomTabsService.java b/customtabs/tests/src/android/support/customtabs/TestCustomTabsService.java
index b5c5e8654ef5b548138614693c6d29119d821c50..e3d5fa8922649538d24d714fef94fc1bd9543bad 100644
--- a/customtabs/tests/src/android/support/customtabs/TestCustomTabsService.java
+++ b/customtabs/tests/src/android/support/customtabs/TestCustomTabsService.java
@@ -71,4 +71,10 @@ public class TestCustomTabsService extends CustomTabsService {
         if (!mPostMessageRequested) return CustomTabsService.RESULT_FAILURE_DISALLOWED;
         return CustomTabsService.RESULT_SUCCESS;
     }
+
+    @Override
+    protected boolean validateRelationship(CustomTabsSessionToken sessionToken,
+                                           @Relation int relation, Uri origin, Bundle extras) {
+        return false;
+    }
 }