Implement Command Line Private extension API

chrome/browser/extensions/api/command_line_private/command_line_private_api.cc

+// Copyright 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 "chrome/browser/extensions/api/command_line_private/command_line_private_api.h"
+
+#include <string>
+
+#include "base/command_line.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+#include "chrome/common/extensions/api/command_line_private.h"
+
+namespace {
+// This should be consistent with
+// chrome/test/data/extensions/api_test/command_line/basics/test.js.
+const char kEmptySwitchName[] = "Switch name is empty.";
+}  // namespace
+
+namespace extensions {
+
+namespace command_line_private = api::command_line_private;
+
+bool CommandLinePrivateHasSwitchFunction::RunImpl() {
+  scoped_ptr<command_line_private::HasSwitch::Params> params(
+      command_line_private::HasSwitch::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params);
+
+  if (params->name.empty()) {
+    error_ = kEmptySwitchName;
+    return false;
+  }
+
+  results_ = command_line_private::HasSwitch::Results::Create(
+      CommandLine::ForCurrentProcess()->HasSwitch(params->name));
+  return true;
+}
+
+}  // namespace extensions