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

mojo/public/cpp/system/system_export.h

+// 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.
+
+#ifndef MOJO_PUBLIC_CPP_SYSTEM_SYSTEM_EXPORT_H_
+#define MOJO_PUBLIC_CPP_SYSTEM_SYSTEM_EXPORT_H_
+
+#if defined(COMPONENT_BUILD)
+
+#if defined(WIN32)
+
+#if defined(MOJO_CPP_SYSTEM_IMPLEMENTATION)
+#define MOJO_CPP_SYSTEM_EXPORT __declspec(dllexport)
+#else
+#define MOJO_CPP_SYSTEM_EXPORT __declspec(dllimport)
+#endif
+
+#else  // !defined(WIN32)
+
+#if defined(MOJO_CPP_SYSTEM_IMPLEMENTATION)
+#define MOJO_CPP_SYSTEM_EXPORT __attribute((visibility("default")))
+#else
+#define MOJO_CPP_SYSTEM_EXPORT
+#endif
+
+#endif  // defined(WIN32)
+
+#else  // !defined(COMPONENT_BUILD)
+
+#define MOJO_CPP_SYSTEM_EXPORT
+
+#endif  // defined(COMPONENT_BUILD)
+
+#endif  // MOJO_PUBLIC_CPP_SYSTEM_SYSTEM_EXPORT_H_