Update from https://crrev.com/327068

base/process/process_metrics_ios.cc

 // 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.
 
 #include "base/process/process_metrics.h"
 
 #include <mach/task.h>
 
+#include "base/logging.h"
+
 namespace base {
 
 namespace {
 
 bool GetTaskInfo(task_basic_info_64* task_info_data) {
   mach_msg_type_number_t count = TASK_BASIC_INFO_64_COUNT;
   kern_return_t kr = task_info(mach_task_self(),
                                TASK_BASIC_INFO_64,
                                reinterpret_cast<task_info_t>(task_info_data),
                                &count);
   return kr == KERN_SUCCESS;
 }
 
 }  // namespace
 
 ProcessMetrics::ProcessMetrics(ProcessHandle process) {}
 
 ProcessMetrics::~ProcessMetrics() {}
 
 // static
 ProcessMetrics* ProcessMetrics::CreateProcessMetrics(ProcessHandle process) {
   return new ProcessMetrics(process);
 }
 
+double ProcessMetrics::GetCPUUsage() {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
 size_t ProcessMetrics::GetPagefileUsage() const {
   task_basic_info_64 task_info_data;
   if (!GetTaskInfo(&task_info_data))
     return 0;
   return task_info_data.virtual_size;
 }
 
 size_t ProcessMetrics::GetWorkingSetSize() const {
   task_basic_info_64 task_info_data;
   if (!GetTaskInfo(&task_info_data))
@@ skipping 19 matching lines @@
 }
 
 void SetFdLimit(unsigned int max_descriptors) {
   // Unimplemented.
 }
 
 size_t GetPageSize() {
   return getpagesize();
 }
 
+// Bytes committed by the system.
+size_t GetSystemCommitCharge() {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
 }  // namespace base