[Merge to 3071] Add the UMA metric Memory.Gpu.PhysicalFootprint.MacOS

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 148 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 the physical footprint, only available on macOS 10.11+. This
+  // measures anonymous, non-discardable memory. Returns 0 on error, or if the
+  // measurement was unavailable.
+  size_t GetPhysicalFootprint() const;
+
   // 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,
                       size_t* locked_bytes) const;
 #endif
 
   // Returns the CPU usage in percent since the last time this method or
@@ skipping 335 matching lines @@
 // |size| and |info| are output parameters, only valid on Success.
 BASE_EXPORT MachVMRegionResult GetBasicInfo(mach_port_t task,
                                             mach_vm_size_t* size,
                                             mach_vm_address_t* address,
                                             vm_region_basic_info_64* info);
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_PROCESS_METRICS_H_