Add IPC handling for INVALID_HANDLE_VALUE on Win64 builds

ipc/ipc_message_utils.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 "ipc/ipc_message_utils.h"
 
 #include "base/files/file_path.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/nullable_string16.h"
@@ skipping 735 matching lines @@
   r->SetHeaderValues(static_cast<int32>(routing_id), type, flags);
   return r->WriteBytes(payload, payload_size);
 }
 
 void ParamTraits<Message>::Log(const Message& p, std::string* l) {
   l->append("<IPC::Message>");
 }
 
 #if defined(OS_WIN)
 // Note that HWNDs/HANDLE/HCURSOR/HACCEL etc are always 32 bits, even on 64
-// bit systems.
+// bit systems. That's why we use the Windows macros to convert to 32 bits.
 void ParamTraits<HANDLE>::Write(Message* m, const param_type& p) {
-  m->WriteUInt32(reinterpret_cast<uint32>(p));
+  m->WriteInt(HandleToLong(p));
 }
 
 bool ParamTraits<HANDLE>::Read(const Message* m, PickleIterator* iter,
                                param_type* r) {
-  uint32 temp;
-  if (!m->ReadUInt32(iter, &temp))
+  int32 temp;
+  if (!m->ReadInt(iter, &temp))
     return false;
-  *r = reinterpret_cast<HANDLE>(temp);
+  *r = LongToHandle(temp);
   return true;
 }
 
 void ParamTraits<HANDLE>::Log(const param_type& p, std::string* l) {
   l->append(StringPrintf("0x%X", p));
 }
 
 void ParamTraits<LOGFONT>::Write(Message* m, const param_type& p) {
   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(LOGFONT));
 }
@@ skipping 37 matching lines @@
   return result;
 }
 
 void ParamTraits<MSG>::Log(const param_type& p, std::string* l) {
   l->append("<MSG>");
 }
 
 #endif  // OS_WIN
 
 }  // namespace IPC