Add MemoryCoordinatorImpl

content/browser/memory/memory_monitor.cc

 // Copyright (c) 2016 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 "content/browser/memory/memory_monitor.h"
 
 #include "base/process/process_metrics.h"
 
 namespace content {
 
 // static
 MemoryMonitorDelegate* MemoryMonitorDelegate::GetInstance() {
   return base::Singleton<
       MemoryMonitorDelegate,
       base::LeakySingletonTraits<MemoryMonitorDelegate>>::get();
 }
 
 MemoryMonitorDelegate::~MemoryMonitorDelegate() {}
 
 void MemoryMonitorDelegate::GetSystemMemoryInfo(
     base::SystemMemoryInfoKB* mem_info) {
   base::GetSystemMemoryInfo(mem_info);
 }
 
+#if defined(OS_MACOSX)
+// TODO(bashi,bcwhite): Remove when memory monitor for mac is available.
+std::unique_ptr<MemoryMonitor> CreateMemoryMonitor() {
+  NOTREACHED();
+  return std::unique_ptr<MemoryMonitor>();
+}
+#endif
+
 }  // namespace content