Add a field platform_private_footprint_ to ProcessMemoryTotals.

components/tracing/common/process_metrics_memory_dump_provider.cc

 // Copyright 2015 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 "components/tracing/common/process_metrics_memory_dump_provider.h"
 
 #include <fcntl.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 604 matching lines @@
   size_t resident_bytes;
   size_t locked_bytes;
   if (!process_metrics_->GetMemoryBytes(&private_bytes, &shared_bytes,
                                         &resident_bytes, &locked_bytes)) {
     return false;
   }
   uint64_t rss_bytes = resident_bytes;
   pmd->process_totals()->SetExtraFieldInBytes("private_bytes", private_bytes);
   pmd->process_totals()->SetExtraFieldInBytes("shared_bytes", shared_bytes);
   pmd->process_totals()->SetExtraFieldInBytes("locked_bytes", locked_bytes);
+
+  if (mac::IsAtLeastOS10_12()) {
+    pmd->process_totals()->set_private_footprint_precursor(
+        process_metrics_->GetPhysicalFootprint());
+  } else {
+    pmd->process_totals()->set_private_footprint_precursor(
+        process_metrics_->GetInternalAndCompressed());
+  }
 #else
   uint64_t rss_bytes = process_metrics_->GetWorkingSetSize();
 #endif  // defined(OS_MACOSX)
   if (rss_bytes_for_testing)
     rss_bytes = rss_bytes_for_testing;
 
   // rss_bytes will be 0 if the process ended while dumping.
   if (!rss_bytes)
     return false;
 
@@ skipping 72 matching lines @@
 #endif
 }
 
 void ProcessMetricsMemoryDumpProvider::SuspendFastMemoryPolling() {
 #if defined(OS_LINUX) || defined(OS_ANDROID)
   fast_polling_statm_fd_.reset();
 #endif
 }
 
 }  // namespace tracing