Add a component installer for Portable NaCl. Registration of installer is

chrome/browser/component_updater/pnacl/pnacl_component_installer.h

Index: chrome/browser/component_updater/pnacl/pnacl_component_installer.h
diff --git a/chrome/browser/component_updater/pnacl/pnacl_component_installer.h b/chrome/browser/component_updater/pnacl/pnacl_component_installer.h
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+++ b/chrome/browser/component_updater/pnacl/pnacl_component_installer.h
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+// Copyright (c) 2011 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_COMPONENT_UPDATER_PNACL_PNACL_COMPONENT_INSTALLER_H_
+#define CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_COMPONENT_INSTALLER_H_
+#pragma once
+
+class ComponentUpdateService;
+class Version;
+
+namespace base {
+class DictionaryValue;
+}
+
+// Component update registration for Portable Native Client.
+void RegisterPnaclComponent(ComponentUpdateService* cus);
+
+// Returns true if this browser is compatible with the given Pnacl component
+// manifest, with the version specified in the manifest in |version_out|.
+bool CheckPnaclComponentManifest(base::DictionaryValue* manifest,
+                                 Version* version_out);
+
+#endif  // CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_COMPONENT_INSTALLER_H_