Add a generic template for system info provider

chrome/browser/extensions/api/system_info_cpu/cpu_info_provider_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/extensions/api/system_info_cpu/cpu_info_provider.h"
+
+namespace extensions {
+
+using api::experimental_system_info_cpu::CpuInfo;
+
+// CpuInfoProvider implementation on Mac OS.
+class CpuInfoProviderMac : public CpuInfoProvider {
+ public:
+  CpuInfoProviderMac() {}
+  virtual ~CpuInfoProviderMac() {}
+  virtual bool QueryInfo(CpuInfo* info) OVERRIDE;
+};
+
+bool CpuInfoProviderMac::QueryInfo(CpuInfo* info) {
+  // TODO(hmin): not implemented yet.
+  return false;
+}
+
+// static
+template<>
+CpuInfoProvider* CpuInfoProvider::Get() {
+  return CpuInfoProvider::GetInstance<CpuInfoProviderMac>();
+}
+
+}  // namespace extensions