[WIP] Provided file system from NACL.

ppapi/cpp/dev/filesystem_provider.h

Index: ppapi/cpp/dev/filesystem_provider.h
diff --git a/ppapi/cpp/dev/filesystem_provider.h b/ppapi/cpp/dev/filesystem_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..3430612824acdfbbf86dc9314f26306aee4bb86a
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+++ b/ppapi/cpp/dev/filesystem_provider.h
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+// 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 FILESYSTEM_PROVIDER_H
+#define FILESYSTEM_PROVIDER_H
+
+#include <string>
+#include <vector>
+
+#include "ppapi/c/dev/ppb_filesystemprovider_dev.h"
+#include "ppapi/cpp/resource.h"
+
+namespace pp{
+
+template <typename T> class CompletionCallbackWithOutput;
+class InstanceHandle;
+class Instance;
+
+class Filesystem_Provider_Dev : Resource {
+ public:
+  // Creates it but doesn't mount it
+  Filesystem_Provider_Dev( pp::Instance *instance );
+  virtual ~Filesystem_Provider_Dev();
+  static bool IsAvailable();
+
+  // PPB_FilesystemProvider interfaces
+  int32_t Mount(
+      const std::string& filesystem_id,
+      const std::string& display_name,
+      bool writable, int32_t opened_files_limit,
+      const CompletionCallbackWithOutput<PP_ProviderError_Dev>& cc );
+  int32_t Unmount(
+      const std::string& filesystem_id,
+      const CompletionCallbackWithOutput<PP_ProviderError_Dev>& cc );
+  // Response for requests
+  int32_t SendSuccessResponse(
+      const PP_OperationType_Dev operation_type,
+      int32_t request_id);
+  int32_t SendErrorResponse(
+      const PP_OperationType_Dev& operation_type,
+      const PP_ProviderError_Dev& error,
+      int32_t request_id);
+  // Special Responses
+  int32_t SendMetadataSuccessResponse(
+      const PP_EntryMetadata_Dev& metadata,
+      int32_t request_id);
+  int32_t SendReadDirectorySuccessResponse(
+      const  std::vector<PP_EntryMetadata_Dev>& entries,
+      bool has_more,
+      int32_t request_id );
+  int32_t SendReadFileSuccessResponse(
+      uint32_t data_size,
+      const char* data,
+      bool has_more,
+      int32_t request_id );
+  int32_t GetNextRequest(
+      const CompletionCallbackWithOutput<PP_FilesystemRequest>& cc);
+  int32_t FreeWriteRequestBuffer(const void *buffer);
+
+protected:
+  InstanceHandle associated_instance_;
+
+}; // class Filesystem_Provider_Dev
+
+} // namespace pp
+
+#endif // FILESYSTEM_PROVIDER_H
+