Add a NaCl-Private interface for opening files in DIR_PNACL_COMPONENT.

chrome/browser/nacl_host/pnacl_file_host.h

Index: chrome/browser/nacl_host/pnacl_file_host.h
diff --git a/chrome/browser/nacl_host/pnacl_file_host.h b/chrome/browser/nacl_host/pnacl_file_host.h
new file mode 100644
index 0000000000000000000000000000000000000000..5166b5be1af38a7c8fb1aecdf75552abeaed1254
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+++ b/chrome/browser/nacl_host/pnacl_file_host.h
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+// Copyright (c) 2012 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 CHROME_BROWSER_NACL_HOST_PNACL_FILE_HOST_H_
+#define CHROME_BROWSER_NACL_HOST_PNACL_FILE_HOST_H_
+
+#include <string>
+
+class ChromeRenderMessageFilter;
+class FilePath;
+
+namespace IPC {
+class Message;
+}  // namespace IPC
+
+// Opens Pnacl Files in the Browser process, on behalf of the NaCl plugin.
+
+namespace pnacl_file_host {
+
+// Open a Pnacl file (readonly) on behalf of the NaCl plugin.
+void GetReadonlyPnaclFd(ChromeRenderMessageFilter* chrome_render_message_filter,
+                        const std::string& filename,
+                        IPC::Message* reply_msg);
+
+// Return true if the filename requested is valid for opening.
+// Sets file_to_open to the FilePath which we will attempt to open.
+bool PnaclCanOpenFile(const std::string& filename,
+                      FilePath *file_to_open);
+
+}  // namespace pnacl_file_host
+
+#endif  // CHROME_BROWSER_NACL_HOST_PNACL_FILE_HOST_H_