Mojo C++ bindings: add a new mode to generator to use native STL/WTF types

mojo/public/cpp/bindings/tests/stl_converters_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/stl_converters.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 55 matching lines @@
   ASSERT_FALSE(mojo_obj2[0].is_null());
   ASSERT_EQ(1u, mojo_obj2[1].size());
   ASSERT_EQ(2u, mojo_obj2[1]["hello"].size());
   ASSERT_EQ(123, mojo_obj2[1]["hello"][0]);
   ASSERT_EQ(456, mojo_obj2[1]["hello"][1]);
 }
 
 TEST_F(STLConvertersTest, StopsAtMojoStruct) {
   Array<NamedRegionPtr> mojo_obj(1);
   mojo_obj[0] = NamedRegion::New();
-  mojo_obj[0]->name = "hello";
-  mojo_obj[0]->rects.resize(3);
+  mojo_obj[0]->name.emplace("hello");
+  mojo_obj[0]->rects.emplace(3);
 
   std::vector<NamedRegionPtr> stl_obj = UnwrapToSTLType(std::move(mojo_obj));
 
   ASSERT_EQ(1u, stl_obj.size());
-  ASSERT_EQ("hello", stl_obj[0]->name);
-  ASSERT_EQ(3u, stl_obj[0]->rects.size());
+  ASSERT_EQ("hello", stl_obj[0]->name.value());
+  ASSERT_EQ(3u, stl_obj[0]->rects->size());
 
   Array<NamedRegionPtr> mojo_obj2 = WrapSTLType(std::move(stl_obj));
 
   ASSERT_EQ(1u, mojo_obj2.size());
-  ASSERT_EQ("hello", mojo_obj2[0]->name);
-  ASSERT_EQ(3u, mojo_obj2[0]->rects.size());
+  ASSERT_EQ("hello", mojo_obj2[0]->name.value());
+  ASSERT_EQ(3u, mojo_obj2[0]->rects->size());
 }
 
 }  // namespace test
 }  // namespace mojo