mac: Fix calulation for number of resident pages in a process.

base/process/process_metrics_linux.cc

 // Copyright (c) 2013 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 "base/process/process_metrics.h"
 
 #include <dirent.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 174 matching lines @@
   return internal::ReadProcStatsAndGetFieldAsSizeT(process_, internal::VM_RSS) *
       getpagesize();
 }
 
 // On linux, we return the high water mark of RSS.
 size_t ProcessMetrics::GetPeakWorkingSetSize() const {
   return ReadProcStatusAndGetFieldAsSizeT(process_, "VmHWM") * 1024;
 }
 
 bool ProcessMetrics::GetMemoryBytes(size_t* private_bytes,
-                                    size_t* shared_bytes) {
+                                    size_t* shared_bytes) const {
   WorkingSetKBytes ws_usage;
   if (!GetWorkingSetKBytes(&ws_usage))
     return false;
 
   if (private_bytes)
     *private_bytes = ws_usage.priv * 1024;
 
   if (shared_bytes)
     *shared_bytes = ws_usage.shared * 1024;
 
@@ skipping 760 matching lines @@
 #if defined(OS_LINUX)
 int ProcessMetrics::GetIdleWakeupsPerSecond() {
   uint64_t wake_ups;
   const char kWakeupStat[] = "se.statistics.nr_wakeups";
   return ReadProcSchedAndGetFieldAsUint64(process_, kWakeupStat, &wake_ups) ?
       CalculateIdleWakeupsPerSecond(wake_ups) : 0;
 }
 #endif  // defined(OS_LINUX)
 
 }  // namespace base