PPAPI: Implement PPB_FileMapping on POSIX

ppapi/thunk/ppb_file_mapping_api.h

Index: ppapi/thunk/ppb_file_mapping_api.h
diff --git a/ppapi/thunk/ppb_file_mapping_api.h b/ppapi/thunk/ppb_file_mapping_api.h
new file mode 100644
index 0000000000000000000000000000000000000000..60f645ac33fcdb0bcb057d675fa9f1501720b579
--- /dev/null
+++ b/ppapi/thunk/ppb_file_mapping_api.h
@@ -0,0 +1,43 @@
+// Copyright (c) 2013 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_THUNK_PPB_FILE_MAPPING_API_H_
+#define PPAPI_THUNK_PPB_FILE_MAPPING_API_H_
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/ppb_file_mapping.h"
+#include "ppapi/shared_impl/singleton_resource_id.h"
+#include "ppapi/thunk/ppapi_thunk_export.h"
+
+namespace ppapi {
+
+class TrackedCallback;
+
+namespace thunk {
+
+class PPAPI_THUNK_EXPORT PPB_FileMapping_API {
+ public:
+  virtual ~PPB_FileMapping_API() {}
+
+  virtual int32_t Map(PP_Instance instance,
+                      PP_Resource file_io,
+                      int64_t length,
+                      uint32_t map_protection,
+                      uint32_t map_flags,
+                      int64_t offset,
+                      void** address,
+                      scoped_refptr<TrackedCallback> callback) = 0;
+  virtual void Unmap(PP_Instance instance, void* address, int64_t length) = 0;
+  virtual int64_t GetMapPageSize(PP_Instance instance) = 0;
+
+  static const SingletonResourceID kSingletonResourceID =
+      FILE_MAPPING_SINGLETON_ID;
+};
+
+}  // namespace thunk
+}  // namespace ppapi
+
+#endif  // PPAPI_THUNK_PPB_FILE_MAPPING_API_H_