Add new wired memory metric to memory-infra dumps.

base/process/process_metrics.h

 // 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.
 
 // This file contains routines for gathering resource statistics for processes
 // running on the system.
 
 #ifndef BASE_PROCESS_PROCESS_METRICS_H_
 #define BASE_PROCESS_PROCESS_METRICS_H_
 
@@ skipping 136 matching lines @@
   // Computes pss (proportional set size) of a process. Note that this
   // function is somewhat expensive on Windows (a few ms per process).
   bool GetProportionalSetSizeBytes(uint64_t* pss_bytes) const;
 
 #if defined(OS_MACOSX)
   // Fills both CommitedKBytes and WorkingSetKBytes in a single operation. This
   // is more efficient on Mac OS X, as the two can be retrieved with a single
   // system call.
   bool GetCommittedAndWorkingSetKBytes(CommittedKBytes* usage,
                                        WorkingSetKBytes* ws_usage) const;
-  // Returns private, shared, and total resident bytes.
+  // Returns private, shared, and total resident bytes. |locked_bytes| refers to
+  // bytes that must stay resident. |locked_bytes| only counts bytes locked by
+  // this task, not bytes locked by the kernel.
   bool GetMemoryBytes(size_t* private_bytes,
                       size_t* shared_bytes,
-                      size_t* resident_bytes) const;
+                      size_t* resident_bytes,
+                      size_t* locked_bytes) const;
 #endif
 
   // Returns the CPU usage in percent since the last time this method or
   // GetPlatformIndependentCPUUsage() was called. The first time this method
   // is called it returns 0 and will return the actual CPU info on subsequent
   // calls. On Windows, the CPU usage value is for all CPUs. So if you have
   // 2 CPUs and your process is using all the cycles of 1 CPU and not the other
   // CPU, this method returns 50.
   double GetCPUUsage();
 
@@ skipping 288 matching lines @@
   SystemDiskInfo disk_info_;
 #endif
 #if defined(OS_CHROMEOS)
   SwapInfo swap_info_;
 #endif
 };
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_PROCESS_METRICS_H_