Fixing remaining VC++ 2015 64-bit build breaks

ipc/ipc_perftest_support.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_perftest_support.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 330 matching lines @@
   return 0;
 }
 
 scoped_refptr<base::TaskRunner> PingPongTestClient::task_runner() {
   return main_message_loop_.task_runner();
 }
 
 LockThreadAffinity::LockThreadAffinity(int cpu_number)
     : affinity_set_ok_(false) {
 #if defined(OS_WIN)
-  const DWORD_PTR thread_mask = 1 << cpu_number;
+  const DWORD_PTR thread_mask = static_cast<DWORD_PTR>(1) << cpu_number;
   old_affinity_ = SetThreadAffinityMask(GetCurrentThread(), thread_mask);
   affinity_set_ok_ = old_affinity_ != 0;
 #elif defined(OS_LINUX)
   cpu_set_t cpuset;
   CPU_ZERO(&cpuset);
   CPU_SET(cpu_number, &cpuset);
   auto get_result = sched_getaffinity(0, sizeof(old_cpuset_), &old_cpuset_);
   DCHECK_EQ(0, get_result);
   auto set_result = sched_setaffinity(0, sizeof(cpuset), &cpuset);
   // Check for get_result failure, even though it should always succeed.
@@ skipping 10 matching lines @@
   auto set_result = SetThreadAffinityMask(GetCurrentThread(), old_affinity_);
   DCHECK_NE(0u, set_result);
 #elif defined(OS_LINUX)
   auto set_result = sched_setaffinity(0, sizeof(old_cpuset_), &old_cpuset_);
   DCHECK_EQ(0, set_result);
 #endif
 }
 
 }  // namespace test
 }  // namespace IPC