Lift the 64K message size limit for postMessage to/from NativeClient.

ppapi/native_client/src/shared/ppapi_proxy/object_serialize.cc

 /*
  * Copyright (c) 2012 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.
  */
 
 #include "native_client/src/shared/ppapi_proxy/object_serialize.h"
 
 #include <limits>
 #include <stdio.h>
@@ skipping 446 matching lines @@
   // Serialize the var.
   if (!SerializePpVar(var, 1, bytes, tmp_length)) {
     return false;
   }
   // Return success.
   *length = tmp_length;
   return true;
 }
 
 char* Serialize(const PP_Var* vars, uint32_t argc, uint32_t* length) {
-  // Length needs to be set.
+  // Length needs to be returnable.
   if (NULL == length) {
     return NULL;
   }
   // No need to do anything if there are no vars to serialize.
   if (0 == argc) {
     *length = 0;
     return NULL;
   }
   // Report an error if no vars are passed but argc > 0.
   if (NULL == vars) {
     return NULL;
   }
   // Compute the size of the buffer.  Zero indicates error.
   uint32_t tmp_length = PpVarVectorSize(vars, argc);
-  if (0 == tmp_length || tmp_length > *length) {
+  if (0 == tmp_length) {
     return NULL;
   }
-  // Allocate the buffer, if the client didn't pass one.
+  // Allocate the buffer.
   char* bytes = new char[tmp_length];
   if (NULL == bytes) {
     return NULL;
   }
   // Serialize the vars.
   if (!SerializePpVar(vars, argc, bytes, tmp_length)) {
     delete[] bytes;
     return NULL;
   }
   // Return success.
@@ skipping 18 matching lines @@
     return false;
   }
   // Read the serialized PP_Vars into the allocated memory.
   if (!DeserializePpVar(bytes, length, vars, argc)) {
     return false;
   }
   return true;
 }
 
 }  // namespace ppapi_proxy