Add the UMA metric Memory.Gpu.PhysicalFootprint.MacOS

chrome/browser/memory_details_mac.cc

 // Copyright (c) 2012 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 "chrome/browser/memory_details.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <set>
@@ skipping 44 matching lines @@
       info.titles = child.titles;
       info.process_type = child.process_type;
       break;
     }
   }
 
   std::unique_ptr<base::ProcessMetrics> metrics =
       base::ProcessMetrics::CreateProcessMetrics(
           pid, content::BrowserChildProcessHost::GetPortProvider());
   metrics->GetCommittedAndWorkingSetKBytes(&info.committed, &info.working_set);
+  info.phys_footprint = metrics->GetPhysicalFootprint();
 
   processes->push_back(info);
 }
 
 }  // namespace
 
 MemoryDetails::MemoryDetails() {
   const base::FilePath browser_process_path =
       base::GetProcessExecutablePath(base::GetCurrentProcessHandle());
 
@@ skipping 49 matching lines @@
 
   // Collect data about Chrome/Chromium.
   for (const base::ProcessId& pid : all_pids)
     CollectProcessDataForChromeProcess(child_info, pid, chrome_processes);
 
   // Finally return to the browser thread.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&MemoryDetails::CollectChildInfoOnUIThread, this));
 }