Turn //mojo/public/cpp/bindings and //mojo/public/cpp/system into components

mojo/public/cpp/system/buffer.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.
 
 // This file provides a C++ wrapping around the Mojo C API for shared buffers,
 // replacing the prefix of "Mojo" with a "mojo" namespace, and using more
 // strongly-typed representations of |MojoHandle|s.
 //
 // Please see "mojo/public/c/system/buffer.h" for complete documentation of the
 // API.
 
 #ifndef MOJO_PUBLIC_CPP_SYSTEM_BUFFER_H_
 #define MOJO_PUBLIC_CPP_SYSTEM_BUFFER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "mojo/public/c/system/buffer.h"
 #include "mojo/public/cpp/system/handle.h"
+#include "mojo/public/cpp/system/system_export.h"
 
 namespace mojo {
 namespace internal {
 
 struct Unmapper {
   void operator()(void* buffer) {
     MojoResult result = MojoUnmapBuffer(buffer);
     DCHECK_EQ(MOJO_RESULT_OK, result);
   }
 };
 
 }  // namespace internal
 
 using ScopedSharedBufferMapping = std::unique_ptr<void, internal::Unmapper>;
 
 class SharedBufferHandle;
 
 typedef ScopedHandleBase<SharedBufferHandle> ScopedSharedBufferHandle;
 
 // A strongly-typed representation of a |MojoHandle| referring to a shared
 // buffer.
-class SharedBufferHandle : public Handle {
+class MOJO_CPP_SYSTEM_EXPORT SharedBufferHandle
+    : NON_EXPORTED_BASE(public Handle) {
  public:
   enum class AccessMode {
     READ_WRITE,
     READ_ONLY,
   };
 
   SharedBufferHandle() {}
   explicit SharedBufferHandle(MojoHandle value) : Handle(value) {}
 
   // Copying and assignment allowed.
@@ skipping 16 matching lines @@
 };
 
 static_assert(sizeof(SharedBufferHandle) == sizeof(Handle),
               "Bad size for C++ SharedBufferHandle");
 static_assert(sizeof(ScopedSharedBufferHandle) == sizeof(SharedBufferHandle),
               "Bad size for C++ ScopedSharedBufferHandle");
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_SYSTEM_BUFFER_H_