Re-enable building both 32 and 64 bit version of the GCP port monitor.

cloud_print/virtual_driver/win/virtual_driver_helpers.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 "cloud_print/virtual_driver/win/virtual_driver_helpers.h"
 
 #include <windows.h>
 #include <winspool.h>
 
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "base/win/windows_version.h"
 #include "cloud_print/common/win/cloud_print_utils.h"
 
 namespace cloud_print {
 
 void DisplayWindowsMessage(HWND hwnd,
                            HRESULT hr,
                            const base::string16& caption) {
   ::MessageBox(hwnd, GetErrorMessage(hr).c_str(), caption.c_str(), MB_OK);
 }
 
+base::string16 GetPortMonitorDllName() {
+  if (IsSystem64Bit()) {
+    return base::string16(L"gcp_portmon64.dll");
+  } else {
+    return base::string16(L"gcp_portmon.dll");
+  }
+}
+
 HRESULT GetPrinterDriverDir(base::FilePath* path) {
   BYTE driver_dir_buffer[MAX_PATH * sizeof(wchar_t)];
   DWORD needed = 0;
   if (!GetPrinterDriverDirectory(NULL, NULL, 1, driver_dir_buffer,
                                  MAX_PATH * sizeof(wchar_t), &needed)) {
     // We could try to allocate a larger buffer if needed > MAX_PATH
     // but that really shouldn't happen.
     return cloud_print::GetLastHResult();
   }
   *path = base::FilePath(reinterpret_cast<wchar_t*>(driver_dir_buffer));
 
   // The XPS driver is a "Level 3" driver
   *path = path->Append(L"3");
   return S_OK;
 }
+
+bool IsSystem64Bit() {
+  base::win::OSInfo::WindowsArchitecture arch =
+      base::win::OSInfo::GetInstance()->architecture();
+  return (arch == base::win::OSInfo::X64_ARCHITECTURE) ||
+         (arch == base::win::OSInfo::IA64_ARCHITECTURE);
 }
+}  // namespace cloud_print