Fill in PlatformPrivateFootprint on Linux 2/2

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 637 matching lines @@
   if (statm_fd == -1)
     return false;
   const static size_t page_size = base::GetPageSize();
   uint64_t resident_pages;
   uint64_t shared_pages;
   bool success = GetResidentAndSharedPagesFromStatmFile(
       statm_fd, &resident_pages, &shared_pages);
   if (!success)
     return false;
 
-  // TODO(hjd): Implement swap in the next CL.
   footprint.rss_anon_bytes = (resident_pages - shared_pages) * page_size;
+  footprint.vm_swap_bytes = process_metrics_->GetVmSwapBytes();
 #endif  // defined(OS_LINUX) || defined(OS_ANDROID)
 
 #if !defined(OS_IOS)
   peak_rss_bytes = process_metrics_->GetPeakWorkingSetSize();
 #if defined(OS_LINUX) || defined(OS_ANDROID)
   if (is_rss_peak_resettable_) {
     std::string clear_refs_file =
         "/proc/" +
         (process_ == base::kNullProcessId ? "self"
                                           : base::IntToString(process_)) +
@@ skipping 72 matching lines @@
 #endif
 }
 
 void ProcessMetricsMemoryDumpProvider::SuspendFastMemoryPolling() {
 #if defined(OS_LINUX) || defined(OS_ANDROID)
   fast_polling_statm_fd_.reset();
 #endif
 }
 
 }  // namespace tracing