Add field-initializing constructors to generated mojo structs.

mojo/public/cpp/bindings/tests/wtf_types_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 "base/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
@@ skipping 140 matching lines @@
   mojo::internal::Deserialize<MojomType>(data, &strs2, &context);
 
   ASSERT_EQ(4u, strs2.size());
   EXPECT_FALSE(strs2[0]);
   EXPECT_EQ("", *strs2[1]);
   EXPECT_EQ(kHelloWorld, *strs2[2]);
   EXPECT_EQ(kUTF8HelloWorld, *strs2[3]);
 }
 
 TEST_F(WTFTypesTest, Serialization_PublicAPI) {
-  blink::TestWTFStructPtr input(blink::TestWTFStruct::New());
-  input->str = kHelloWorld;
-  input->integer = 42;
+  blink::TestWTFStructPtr input(blink::TestWTFStruct::New(kHelloWorld, 42));
 
   blink::TestWTFStructPtr cloned_input = input.Clone();
 
   auto data = blink::TestWTFStruct::Serialize(&input);
 
   blink::TestWTFStructPtr output;
   ASSERT_TRUE(blink::TestWTFStruct::Deserialize(std::move(data), &output));
   EXPECT_TRUE(cloned_input.Equals(output));
 }
 
@@ skipping 64 matching lines @@
     //     WTF::String>>.
     ptr->EchoStringMap(maps[i],
                        base::Bind(&ExpectStringMap, base::Unretained(&maps[i]),
                                   loop.QuitClosure()));
     loop.Run();
   }
 }
 
 }  // namespace test
 }  // namespace mojo