Pepper/Flapper: Add very basic clipboard support.

ppapi/c/private/ppb_flash_clipboard.h

Index: ppapi/c/private/ppb_flash_clipboard.h
diff --git a/ppapi/c/private/ppb_flash_clipboard.h b/ppapi/c/private/ppb_flash_clipboard.h
new file mode 100644
index 0000000000000000000000000000000000000000..c16ae36f2708c31abb75fccfc2de214b280e3234
--- /dev/null
+++ b/ppapi/c/private/ppb_flash_clipboard.h
@@ -0,0 +1,33 @@
+// 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_C_PRIVATE_PPB_FLASH_CLIPBOARD_H_
+#define PPAPI_C_PRIVATE_PPB_FLASH_CLIPBOARD_H_
+
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_var.h"
+
+#define PPB_FLASH_CLIPBOARD_INTERFACE "PPB_Flash_Clipboard;2"
+
+typedef enum {
+  PP_FLASH_CLIPBOARD_TYPE_STANDARD = 0,
+  PP_FLASH_CLIPBOARD_TYPE_SELECTION = 1,
+  PP_FLASH_CLIPBOARD_TYPE_DRAG = 2
+} PP_Flash_Clipboard_Type;
+
+struct PPB_Flash_Clipboard {
+  // Reads plain text data from the clipboard.
+  struct PP_Var (*ReadPlainText)(PP_Instance instance_id,
+                                 PP_Flash_Clipboard_Type clipboard_type);
+
+  // Writes plain text data to the clipboard. If |text| is too large, it will
+  // return |PP_ERROR_NOSPACE| (and not write to the clipboard).
+  int32_t (*WritePlainText)(PP_Instance instance_id,
+                            PP_Flash_Clipboard_Type clipboard_type,
+                            struct PP_Var text);
+
+  // TODO(vtl): More formats, a |IsFormatAvailable()|, ....
+};
+
+#endif  // PPAPI_C_PRIVATE_PPB_FLASH_CLIPBOARD_H_