Add the implementation skeleton for systeminfo.cpu API

chrome/browser/extensions/api/system_info_cpu/system_info_cpu_api.h

+// 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.
+#ifndef CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_CPU_SYSTEM_INFO_CPU_API_H_
+#define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_CPU_SYSTEM_INFO_CPU_API_H_
+
+#include "chrome/browser/extensions/extension_function.h"
+
+namespace extensions {
+
+class CpuInfoProvider;
+
+class SystemInfoCpuGetFunction : public AsyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.systemInfo.cpu.get");
+  SystemInfoCpuGetFunction();
+
+ private:
+  virtual ~SystemInfoCpuGetFunction();
+  virtual bool RunImpl() OVERRIDE;
+  void WorkOnFileThread();
+  void RespondOnUIThread(bool success);
+  void GetCpuInfoOnFileThread();
+
+  // The CpuInfoProvider instance, lives on FILE thread.
+  CpuInfoProvider* provider_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_CPU_SYSTEM_INFO_CPU_API_H_