Add field-initializing constructors to generated mojo structs.

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

 // Copyright 2013 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 <stdint.h>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 77 matching lines @@
       // Ensure that simply accessing request->pipe does not close it.
       EXPECT_TRUE(request->pipe.is_valid());
     }
 
     ScopedMessagePipeHandle pipe0;
     if (!text2.empty()) {
       CreateMessagePipe(nullptr, &pipe0, &pipe1_);
       EXPECT_TRUE(WriteTextMessage(pipe1_.get(), text2));
     }
 
-    sample::ResponsePtr response(sample::Response::New());
-    response->x = 2;
-    response->pipe = std::move(pipe0);
+    sample::ResponsePtr response(sample::Response::New(2, std::move(pipe0)));
     callback.Run(std::move(response), text1);
 
     if (request->obj)
       request->obj->DoSomething();
   }
 
   void DoStuff2(ScopedDataPipeConsumerHandle pipe,
                 const DoStuff2Callback& callback) override {
     // Read the data from the pipe, writing the response (as a string) to
     // DidStuff2().
@@ skipping 96 matching lines @@
   EXPECT_TRUE(WriteTextMessage(pipe0.handle1.get(), kText1));
 
   MessagePipe pipe1;
   EXPECT_TRUE(WriteTextMessage(pipe1.handle1.get(), kText2));
 
   imported::ImportedInterfacePtr imported;
   base::RunLoop run_loop;
   ImportedInterfaceImpl imported_impl(MakeRequest(&imported),
                                       run_loop.QuitClosure());
 
-  sample::RequestPtr request(sample::Request::New());
-  request->x = 1;
-  request->pipe = std::move(pipe1.handle0);
-  request->obj = std::move(imported);
+  sample::RequestPtr request(sample::Request::New(
+      1, std::move(pipe1.handle0), base::nullopt, std::move(imported)));
   bool got_response = false;
   std::string got_text_reply;
   base::RunLoop run_loop2;
   factory->DoStuff(std::move(request), std::move(pipe0.handle0),
                    base::Bind(&DoStuff, &got_response, &got_text_reply,
                               run_loop2.QuitClosure()));
 
   EXPECT_FALSE(got_response);
   int count_before = ImportedInterfaceImpl::do_something_count();
 
   run_loop.Run();
   run_loop2.Run();
 
   EXPECT_TRUE(got_response);
   EXPECT_EQ(kText1, got_text_reply);
   EXPECT_EQ(1, ImportedInterfaceImpl::do_something_count() - count_before);
 }
 
 TEST_F(HandlePassingTest, PassInvalid) {
   sample::FactoryPtr factory;
   SampleFactoryImpl factory_impl(MakeRequest(&factory));
 
-  sample::RequestPtr request(sample::Request::New());
-  request->x = 1;
+  sample::RequestPtr request(sample::Request::New(1));
   bool got_response = false;
   std::string got_text_reply;
   base::RunLoop run_loop;
   factory->DoStuff(std::move(request), ScopedMessagePipeHandle(),
                    base::Bind(&DoStuff, &got_response, &got_text_reply,
                               run_loop.QuitClosure()));
 
   EXPECT_FALSE(got_response);
 
   run_loop.Run();
@@ skipping 95 matching lines @@
   run_loop.Run();
   run_loop2.Run();
 
   EXPECT_EQ(std::string("object1"), name1);
   EXPECT_EQ(std::string("object2"), name2);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo