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

ppapi/api/dev/ppb_memory_dev.idl

 /* 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_DEV_PPB_MEMORY_DEV_H_
-#define PPAPI_C_DEV_PPB_MEMORY_DEV_H_
-
-#include "ppapi/c/pp_stdint.h"
-
-#define PPB_MEMORY_DEV_INTERFACE_0_1 "PPB_Memory(Dev);0.1"
-#define PPB_MEMORY_DEV_INTERFACE PPB_MEMORY_DEV_INTERFACE_0_1
 
 /**
- * @file
- * This file defines the PPB_Memory interface defined by the browser and
- * and containing pointers to functions related to memory management.
+ * This file defines the <code>PPB_Memory interface</code> for functions
+ * related to memory management.
  */
 
-/**
- * @addtogroup Interfaces
- * @{
- */
+label Chrome {
+  M14 = 0.1
+};
 
 /**
  * The PPB_Memory_Dev interface contains pointers to functions related to memory
  * management.
  *
  */
-struct PPB_Memory_Dev {
+interface PPB_Memory_Dev {
   /**
    * MemAlloc is a pointer to a function that allocate memory.
    *
    * @param[in] num_bytes A number of bytes to allocate.
    * @return A pointer to the memory if successful, NULL If the
    * allocation fails.
    */
-  void* (*MemAlloc)(uint32_t num_bytes);
+  mem_t MemAlloc(
+      [in] uint32_t num_bytes);
 
   /**
    * MemFree is a pointer to a function that deallocates memory.
    *
    * @param[in] ptr A pointer to the memory to deallocate. It is safe to
    * pass NULL to this function.
    */
-  void (*MemFree)(void* ptr);
+  void MemFree(
+      [inout] mem_t ptr);
 };
-/**
- * @}
- */
-
-#endif  /* PPAPI_C_DEV_PPB_MEMORY_DEV_H_ */