Convert a few ppapi dev interfaces to IDL. NaCl has tests for these

ppapi/api/dev/pp_cursor_type_dev.idl

Index: ppapi/api/dev/pp_cursor_type_dev.idl
diff --git a/ppapi/c/dev/pp_cursor_type_dev.h b/ppapi/api/dev/pp_cursor_type_dev.idl
similarity index 88%
copy from ppapi/c/dev/pp_cursor_type_dev.h
copy to ppapi/api/dev/pp_cursor_type_dev.idl
index 191df9f67a782be4f41effe34ebc5b7a6920cbdb..2d47b2c821beda153e1d45d21138df7fd466aab5 100644
--- a/ppapi/c/dev/pp_cursor_type_dev.h
+++ b/ppapi/api/dev/pp_cursor_type_dev.idl
@@ -2,11 +2,12 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
-#ifndef PPAPI_C_DEV_PP_CURSORTYPE_DEV_H_
-#define PPAPI_C_DEV_PP_CURSORTYPE_DEV_H_
 
-#include "ppapi/c/pp_macros.h"
+/**
+ * This file defines enumerations for cursor types.
+ */
 
+[assert_size(4)]
 enum PP_CursorType_Dev {
   PP_CURSORTYPE_CUSTOM = -1,
   PP_CURSORTYPE_POINTER = 0,
@@ -53,7 +54,4 @@ enum PP_CursorType_Dev {
   PP_CURSORTYPE_GRAB = 41,
   PP_CURSORTYPE_GRABBING = 42
 };
-PP_COMPILE_ASSERT_ENUM_SIZE_IN_BYTES(PP_CursorType_Dev, 4);
-
-#endif  /* PPAPI_C_DEV_PP_CURSORTYPE_DEV_H_ */