Fill in PlatformPrivateFootprint on Linux 2/2

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 271 matching lines @@
     else if (key == "wchar")
       target_counter = &io_counters->WriteTransferCount;
     if (!target_counter)
       continue;
     bool converted = StringToUint64(value_str, target_counter);
     DCHECK(converted);
   }
   return true;
 }
 
+#if defined(OS_LINUX) || defined(OS_ANDROID)
+uint64_t ProcessMetrics::GetVmSwapBytes() const {
+  return ReadProcStatusAndGetFieldAsSizeT(process_, "VmSwap") * 1024;
+}
+#endif  // defined(OS_LINUX) || defined(OS_ANDROID)
+
 #if defined(OS_LINUX) || defined(OS_AIX)
 int ProcessMetrics::GetOpenFdCount() const {
   // Use /proc/<pid>/fd to count the number of entries there.
   FilePath fd_path = internal::GetProcPidDir(process_).Append("fd");
 
   DirReaderPosix dir_reader(fd_path.value().c_str());
   if (!dir_reader.IsValid())
     return -1;
 
   int total_count = 0;
@@ skipping 647 matching lines @@
 int ProcessMetrics::GetIdleWakeupsPerSecond() {
   uint64_t num_switches;
   static const char kSwitchStat[] = "voluntary_ctxt_switches";
   return ReadProcStatusAndGetFieldAsUint64(process_, kSwitchStat, &num_switches)
              ? CalculateIdleWakeupsPerSecond(num_switches)
              : 0;
 }
 #endif  // defined(OS_LINUX) || defined(OS_AIX)
 
 }  // namespace base