Sang's initial CL for moving the file interface out of dev.

ppapi/cpp/file_system.h

Index: ppapi/cpp/file_system.h
===================================================================
--- ppapi/cpp/file_system.h	(revision 0)
+++ ppapi/cpp/file_system.h	(revision 0)
@@ -0,0 +1,32 @@
+// Copyright (c) 2011 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 PPAPI_CPP_FILE_SYSTEM_H_
+#define PPAPI_CPP_FILE_SYSTEM_H_
+
+#include "ppapi/c/pp_file_info.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/c/pp_time.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/resource.h"
+
+struct PP_FileInfo;
+
+namespace pp {
+
+class CompletionCallback;
+class FileRef;
+
+// Wraps methods from ppb_file_system.h
+class FileSystem : public Resource {
+ public:
+  FileSystem(Instance* instance, PP_FileSystemType type);
+
+  int32_t Open(int64_t expected_size, const CompletionCallback& cc);
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_FILE_SYSTEM_H_