Mojo C++ bindings: expose serialization public API for mojo structs.

mojo/public/cpp/bindings/struct_ptr.h

 // Copyright 2014 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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_
 
 #include <new>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/type_converter.h"
 
 namespace mojo {
 namespace internal {
 
 template <typename Struct>
 class StructHelper {
  public:
   template <typename Ptr>
   static void Initialize(Ptr* ptr) {
     ptr->Initialize();
   }
 };
 
 }  // namespace internal
 
 // Smart pointer wrapping a mojom structure with move-only semantics.
-template <typename Struct>
+template <typename S>
 class StructPtr {
  public:
+  using Struct = S;
 
   StructPtr() : ptr_(nullptr) {}
   StructPtr(decltype(nullptr)) : ptr_(nullptr) {}
 
   ~StructPtr() { delete ptr_; }
 
   StructPtr& operator=(decltype(nullptr)) {
     reset();
     return *this;
   }
@@ skipping 67 matching lines @@
     reset();
     Swap(other);
   }
 
   Struct* ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(StructPtr);
 };
 
 // Designed to be used when Struct is small and copyable.
-template <typename Struct>
+template <typename S>
 class InlinedStructPtr {
  public:
+  using Struct = S;
 
   InlinedStructPtr() : is_null_(true) {}
   InlinedStructPtr(decltype(nullptr)) : is_null_(true) {}
 
   ~InlinedStructPtr() {}
 
   InlinedStructPtr& operator=(decltype(nullptr)) {
     reset();
     return *this;
   }
@@ skipping 67 matching lines @@
 
   mutable Struct value_;
   bool is_null_;
 
   DISALLOW_COPY_AND_ASSIGN(InlinedStructPtr);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_STRUCT_PTR_H_