Split ProcessHandle and its related routines into base/process/process_handle.h.

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 <sys/stat.h>
 #include <sys/time.h>
@@ skipping 478 matching lines @@
     int num_res = sscanf(mali_memory_data.c_str(), "%lld bytes", &mali_size);
     if (num_res == 1)
       meminfo->gem_size += mali_size;
   }
 #endif  // defined(ARCH_CPU_ARM_FAMILY)
 #endif  // defined(OS_CHROMEOS)
 
   return true;
 }
 
+const char kProcSelfExe[] = "/proc/self/exe";
+
+int GetNumberOfThreads(ProcessHandle process) {
+  return internal::ReadProcStatsAndGetFieldAsInt(process,
+                                                 internal::VM_NUMTHREADS);
+}
+
 }  // namespace base