Add field-initializing constructors to generated mojo structs.

mojo/public/cpp/bindings/tests/hash_unittest.cc

 // Copyright 2016 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.
 
 #include "mojo/public/cpp/bindings/lib/hash_util.h"
 
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 namespace {
 
 using HashTest = testing::Test;
 
-static ContainsOtherPtr MakeContainsOther(uint64_t other) {
-  ContainsOtherPtr ptr = ContainsOther::New();
-  ptr->other = other;
-  return ptr;
-}
-
-static SimpleNestedStructPtr MakeSimpleNestedStruct(ContainsOtherPtr nested) {
-  SimpleNestedStructPtr ptr = SimpleNestedStruct::New();
-  ptr->nested = std::move(nested);
-  return ptr;
-}
-
 TEST_F(HashTest, NestedStruct) {
   // Just check that this template instantiation compiles.
   ASSERT_EQ(
       ::mojo::internal::Hash(::mojo::internal::kHashSeed,
-                             MakeSimpleNestedStruct(MakeContainsOther(1))),
+                             SimpleNestedStruct::New(ContainsOther::New(1))),
       ::mojo::internal::Hash(::mojo::internal::kHashSeed,
-                             MakeSimpleNestedStruct(MakeContainsOther(1))));
+                             SimpleNestedStruct::New(ContainsOther::New(1))));
 }
 
 TEST_F(HashTest, UnmappedNativeStruct) {
   // Just check that this template instantiation compiles.
   ASSERT_EQ(::mojo::internal::Hash(::mojo::internal::kHashSeed,
                                    UnmappedNativeStruct::New()),
             ::mojo::internal::Hash(::mojo::internal::kHashSeed,
                                    UnmappedNativeStruct::New()));
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo