Fix missing symbols for pre-linking of the Cast sender library for iOS.

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>
 
 namespace base {
 
@@ skipping 12 matching lines @@
 
 ProcessMetrics::ProcessMetrics(ProcessHandle process) {}
 
 ProcessMetrics::~ProcessMetrics() {}
 
 // static
 ProcessMetrics* ProcessMetrics::CreateProcessMetrics(ProcessHandle process) {
   return new ProcessMetrics(process);
 }
 
+double ProcessMetrics::GetCPUUsage() {
+  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() {
+  return 0;
+}
+
 }  // namespace base