Pepper: Add a C++ wrapper for the trusted file chooser.

ppapi/cpp/trusted/file_chooser_trusted.h

Index: ppapi/cpp/trusted/file_chooser_trusted.h
diff --git a/ppapi/cpp/trusted/file_chooser_trusted.h b/ppapi/cpp/trusted/file_chooser_trusted.h
new file mode 100644
index 0000000000000000000000000000000000000000..a0227ef030812bad69be86e82401712506feed67
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+++ b/ppapi/cpp/trusted/file_chooser_trusted.h
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+// 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_TRUSTED_FILE_CHOOSER_TRUSTED_H_
+#define PPAPI_CPP_TRUSTED_FILE_CHOOSER_TRUSTED_H_
+
+#include <string>
+
+#include "ppapi/cpp/dev/file_chooser_dev.h"
+
+namespace pp {
+
+class FileChooser_Trusted : public FileChooser_Dev {
+ public:
+  /// Creates an is_null() FileChooser_Trusted object.
+  FileChooser_Trusted();
+
+  FileChooser_Trusted(const Instance* instance,
+                      PP_FileChooserMode_Dev mode,
+                      const Var& accept_mime_types,
+                      bool save_as,
+                      const std::string& suggested_file_name);
+
+  FileChooser_Trusted(const FileChooser_Trusted& other);
+
+  // Overrides of method in superclass. This shows without requiring a user
+  // gesture (and can also show save dialogs).
+  virtual int32_t Show(const CompletionCallback& cc);
+
+ private:
+  const bool save_as_;
+  const std::string suggested_file_name_;
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_TRUSTED_FILE_CHOOSER_TRUSTED_H_