Pepper/Flapper: Add C++ wrappers for PPB_Flash_Clipboard.

ppapi/cpp/private/flash_clipboard.h

+// 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 PPAPI_CPP_PRIVATE_FLASH_CLIPBOARD_H_
+#define PPAPI_CPP_PRIVATE_FLASH_CLIPBOARD_H_
+
+#include <string>
+
+#include "ppapi/c/private/ppb_flash_clipboard.h"
+
+namespace pp {
+
+class Instance;
+
+namespace flash {
+
+class Clipboard {
+ public:
+  // Returns true if the required interface is available.
+  static bool IsAvailable();
+
+  // Returns true if the given format is available from the given clipboard.
+  static bool IsFormatAvailable(Instance* instance,
+                                PP_Flash_Clipboard_Type clipboard_type,
+                                PP_Flash_Clipboard_Format format);
+
+  // Returns true on success, in which case |text_out| will be filled with plain
+  // text read from the given clipboard.
+  static bool ReadPlainText(Instance* instance,
+                            PP_Flash_Clipboard_Type clipboard_type,
+                            std::string* text_out);
+
+  // Returns true on success (it may fail if |text| is too big).
+  static bool WritePlainText(Instance* instance,
+                             PP_Flash_Clipboard_Type clipboard_type,
+                             const std::string& text);
+};
+
+}  // namespace flash
+}  // namespace pp
+
+#endif  // PPAPI_CPP_PRIVATE_FLASH_CLIPBOARD_H_