Mojo C++ bindings: custom type mapping of map

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

 // Copyright 2015 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/callback.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
@@ skipping 207 matching lines @@
   StructWithTraitsImpl input;
   input.set_bool(true);
   input.set_uint32(7);
   input.set_uint64(42);
   input.set_string("hello world!");
   input.get_mutable_string_array().assign({"hello", "world!"});
   input.get_mutable_struct().value = 42;
   input.get_mutable_struct_array().resize(2);
   input.get_mutable_struct_array()[0].value = 1;
   input.get_mutable_struct_array()[1].value = 2;
+  input.get_mutable_struct_map()["hello"] = NestedStructWithTraitsImpl(1024);
+  input.get_mutable_struct_map()["world"] = NestedStructWithTraitsImpl(2048);
 
   base::RunLoop loop;
   TraitsTestServicePtr proxy = GetTraitsTestProxy();
 
   proxy->EchoStructWithTraits(input, [&](const StructWithTraitsImpl& passed) {
     EXPECT_EQ(input.get_bool(), passed.get_bool());
     EXPECT_EQ(input.get_uint32(), passed.get_uint32());
     EXPECT_EQ(input.get_uint64(), passed.get_uint64());
     EXPECT_EQ(input.get_string(), passed.get_string());
     EXPECT_EQ(input.get_string_array(), passed.get_string_array());
     EXPECT_EQ(input.get_struct(), passed.get_struct());
     EXPECT_EQ(input.get_struct_array(), passed.get_struct_array());
+    EXPECT_EQ(input.get_struct_map(), passed.get_struct_map());
     loop.Quit();
   });
   loop.Run();
 }
 
 TEST_F(StructTraitsTest, EchoPassByValueStructWithTraits) {
   MessagePipe mp;
   PassByValueStructWithTraitsImpl input;
   input.get_mutable_handle().reset(mp.handle0.release());
 
@@ skipping 25 matching lines @@
   uint32_t buffer_size = static_cast<uint32_t>(sizeof(buffer));
   EXPECT_EQ(MOJO_RESULT_OK,
             ReadMessageRaw(received.get(), buffer, &buffer_size, nullptr,
                            nullptr, MOJO_READ_MESSAGE_FLAG_NONE));
   EXPECT_EQ(kHelloSize, buffer_size);
   EXPECT_STREQ(kHello, buffer);
 }
 
 }  // namespace test
 }  // namespace mojo