Generate java bindings for structs.

mojo/public/interfaces/bindings/tests/validation_test_interfaces.mojom

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+
+[JavaPackage="org.chromium.mojo.bindings.test.mojom.mojo"]
 module mojo.test {
 
 struct StructA {
   uint64 i;
 };
 
 struct StructB {
   StructA struct_a;
 };
 
@@ skipping 33 matching lines @@
 interface IntegrationTestInterface1 {
   Method0(BasicStruct param0);
 };
 
 [Client=IntegrationTestInterface1]
 interface IntegrationTestInterface2 {
   Method0() => (uint8[] param0);
 };
 
 }