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

ppapi/c/dev/pp_cursor_type_dev.h

Index: ppapi/c/dev/pp_cursor_type_dev.h
diff --git a/ppapi/c/dev/pp_cursor_type_dev.h b/ppapi/c/dev/pp_cursor_type_dev.h
index 191df9f67a782be4f41effe34ebc5b7a6920cbdb..82967a77edd3ffa107bfd065eefe8bad51685bb8 100644
--- a/ppapi/c/dev/pp_cursor_type_dev.h
+++ b/ppapi/c/dev/pp_cursor_type_dev.h
@@ -2,11 +2,24 @@
  * 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_
+
+/* From dev/pp_cursor_type_dev.idl modified Thu Nov 17 15:27:17 2011. */
+
+#ifndef PPAPI_C_DEV_PP_CURSOR_TYPE_DEV_H_
+#define PPAPI_C_DEV_PP_CURSOR_TYPE_DEV_H_
 
 #include "ppapi/c/pp_macros.h"
 
+/**
+ * @file
+ * This file defines enumerations for cursor types.
+ */
+
+
+/**
+ * @addtogroup Enums
+ * @{
+ */
 enum PP_CursorType_Dev {
   PP_CURSORTYPE_CUSTOM = -1,
   PP_CURSORTYPE_POINTER = 0,
@@ -54,6 +67,9 @@ enum PP_CursorType_Dev {
   PP_CURSORTYPE_GRABBING = 42
 };
 PP_COMPILE_ASSERT_ENUM_SIZE_IN_BYTES(PP_CursorType_Dev, 4);
+/**
+ * @}
+ */
 
-#endif  /* PPAPI_C_DEV_PP_CURSORTYPE_DEV_H_ */
+#endif  /* PPAPI_C_DEV_PP_CURSOR_TYPE_DEV_H_ */