Add a "native_support" service.

services/native_support/process_io_redirection.h

Index: services/native_support/process_io_redirection.h
diff --git a/services/native_support/process_io_redirection.h b/services/native_support/process_io_redirection.h
new file mode 100644
index 0000000000000000000000000000000000000000..00e3461dd70cf9659062b01f93d852cd0eb213a9
--- /dev/null
+++ b/services/native_support/process_io_redirection.h
@@ -0,0 +1,74 @@
+// 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.
+
+#ifndef SERVICES_NATIVE_SUPPORT_PROCESS_IO_REDIRECTION_H_
+#define SERVICES_NATIVE_SUPPORT_PROCESS_IO_REDIRECTION_H_
+
+#include <memory>
+
+#include "base/files/scoped_file.h"
+#include "base/macros.h"
+#include "mojo/services/files/public/interfaces/file.mojom.h"
+#include "services/native_support/redirectors.h"
+
+namespace native_support {
+
+class ProcessIORedirection {
+ public:
+  virtual ~ProcessIORedirection() {}
+
+ protected:
+  ProcessIORedirection() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ProcessIORedirection);
+};
+
+class ProcessIORedirectionForStdIO : public ProcessIORedirection {
+ public:
+  ProcessIORedirectionForStdIO(mojo::files::FilePtr stdin_file,
+                               mojo::files::FilePtr stdout_file,
+                               mojo::files::FilePtr stderr_file,
+                               base::ScopedFD stdin_fd,
+                               base::ScopedFD stdout_fd,
+                               base::ScopedFD stderr_fd);
+  ~ProcessIORedirectionForStdIO() override;
+
+ private:
+  mojo::files::FilePtr stdin_file_;
+  mojo::files::FilePtr stdout_file_;
+  mojo::files::FilePtr stderr_file_;
+  base::ScopedFD stdin_fd_;
+  base::ScopedFD stdout_fd_;
+  base::ScopedFD stderr_fd_;
+
+  // The above things must outlive these.
+  std::unique_ptr<MojoFileToFDRedirector> stdin_redirector_;
+  std::unique_ptr<FDToMojoFileRedirector> stdout_redirector_;
+  std::unique_ptr<FDToMojoFileRedirector> stderr_redirector_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessIORedirectionForStdIO);
+};
+
+class ProcessIORedirectionForTerminal : public ProcessIORedirection {
+ public:
+  ProcessIORedirectionForTerminal(mojo::files::FilePtr terminal_file,
+                                  base::ScopedFD terminal_fd);
+  ~ProcessIORedirectionForTerminal() override;
+
+ private:
+  mojo::files::FilePtr terminal_file_;
+  base::ScopedFD terminal_fd_;
+
+  // The above things must outlive these.
+  // TODO(vtl): We should have a bidirectional redirector instead.
+  MojoFileToFDRedirector input_redirector_;
+  FDToMojoFileRedirector output_redirector_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessIORedirectionForTerminal);
+};
+
+}  // namespace native_support
+
+#endif  // SERVICES_NATIVE_SUPPORT_PROCESS_IO_REDIRECTION_H_