Make a new test to enforce the sizes of all structs and enums in the C API....

ppapi/c/ppb_url_response_info.h

 // Copyright (c) 2010 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_PPB_URL_RESPONSE_INFO_H_
 #define PPAPI_C_PPB_URL_RESPONSE_INFO_H_
 
 #include "ppapi/c/pp_bool.h"
+#include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_var.h"
 
 typedef enum {
   PP_URLRESPONSEPROPERTY_URL,             // string
   PP_URLRESPONSEPROPERTY_REDIRECTURL,     // string
   PP_URLRESPONSEPROPERTY_REDIRECTMETHOD,  // string
   PP_URLRESPONSEPROPERTY_STATUSCODE,      // int32
   PP_URLRESPONSEPROPERTY_STATUSLINE,      // string
   PP_URLRESPONSEPROPERTY_HEADERS          // string, \n-delim
 } PP_URLResponseProperty;
+PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_URLResponseProperty, 4);
 
 #define PPB_URLRESPONSEINFO_INTERFACE "PPB_URLResponseInfo;1"
 
 struct PPB_URLResponseInfo {
   // Returns PP_TRUE if the given resource is an URLResponseInfo. Returns
   // PP_FALSE if the resource is invalid or some type other than an
   // URLResponseInfo.
   PP_Bool (*IsURLResponseInfo)(PP_Resource resource);
 
   // Gets a response property.  Return PP_VarType_Void if an input parameter is
   // invalid.
   struct PP_Var (*GetProperty)(PP_Resource response,
                                PP_URLResponseProperty property);
 
   // Returns a FileRef pointing to the file containing the response body.  This
   // is only valid if PP_URLREQUESTPROPERTY_STREAMTOFILE was set on the
   // URLRequestInfo used to produce this response.  This file remains valid
   // until the URLLoader associated with this URLResponseInfo is closed or
   // destroyed.  Returns 0 if PP_URLREQUESTPROPERTY_STREAMTOFILE was not
   // requested or if the URLLoader has not been opened yet.
   PP_Resource (*GetBodyAsFileRef)(PP_Resource response);
 };
 
 #endif  // PPAPI_C_PPB_URL_RESPONSE_INFO_H_