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

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

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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/plugin_ppb_pdf.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
 
@@ skipping 19 matching lines @@
 const int32_t kMaxFindResults =
     kMaxFindResultsBytes / kPpbPrivateFindResultBytes;
 
 PP_Var GetLocalizedString(
     PP_Instance instance,
     PP_ResourceString string_id) {
   DebugPrintf("PPB_PDF::GetLocalizedString: "
               "instance=%"NACL_PRIu32"\n", instance);
 
   NaClSrpcChannel* channel = GetMainSrpcChannel();
-  nacl_abi_size_t string_size = kMaxVarSize;
-  nacl::scoped_array<char> string_bytes(new char[kMaxVarSize]);
+  nacl_abi_size_t string_size = kMaxReturnVarSize;
+  nacl::scoped_array<char> string_bytes(new char[string_size]);
   NaClSrpcError srpc_result =
       PpbPdfRpcClient::PPB_PDF_GetLocalizedString(
           channel,
           instance,
           static_cast<int32_t>(string_id),
           &string_size, string_bytes.get());
 
   PP_Var string = PP_MakeUndefined();
   if (srpc_result == NACL_SRPC_RESULT_OK) {
     (void) DeserializeTo(string_bytes.get(), string_size, 1, &string);
@@ skipping 136 matching lines @@
       PpbPdfRpcClient::PPB_PDF_HistogramPDFPageCount(GetMainSrpcChannel(),
                                                      count);
 
   DebugPrintf("PPB_PDF::HistogramPDFPageCount: %s\n",
               NaClSrpcErrorString(srpc_result));
 }
 
 void UserMetricsRecordAction(struct PP_Var action) {
   DebugPrintf("PPB_PDF::UserMetricsRecordAction\n");
 
-  nacl_abi_size_t action_size = kMaxVarSize;
+  nacl_abi_size_t action_size = 0;
   nacl::scoped_array<char> action_bytes(
       Serialize(&action, 1, &action_size));
   NaClSrpcError srpc_result =
       PpbPdfRpcClient::PPB_PDF_UserMetricsRecordAction(GetMainSrpcChannel(),
                                                        action_size,
                                                        action_bytes.get());
 
   DebugPrintf("PPB_PDF::UserMetricsRecordAction: %s\n",
               NaClSrpcErrorString(srpc_result));
 }
@@ skipping 34 matching lines @@
     SetContentRestriction,
     HistogramPDFPageCount,
     UserMetricsRecordAction,
     HasUnsupportedFeature,
     SaveAs
   };
   return &pdf_interface;
 }
 
 }  // namespace ppapi_proxy
-