Add the implementation skeleton for systeminfo.cpu API

chrome/browser/extensions/api/systeminfo_cpu/systeminfo_cpu_apitest.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 "base/command_line.h"
+#include "chrome/browser/extensions/extension_apitest.h"
+#include "chrome/common/chrome_switches.h"
+
+namespace extensions {
+class SysteminfoCpuApiTest: public ExtensionApiTest {
+public:
+  SysteminfoCpuApiTest() {}
+  ~SysteminfoCpuApiTest() {}
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    ExtensionApiTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitch(switches::kEnableExperimentalExtensionApis);
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(SysteminfoCpuApiTest, SysteminfoCpuApi) {
+  ASSERT_TRUE(RunExtensionTest("systeminfo/cpu")) << message_;
+}
+
+}  // namespace extensions