Turn on component updater on chromeos, only for the pnacl component.

chrome/browser/component_updater/pnacl/pnacl_component_installer.h

 // 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_
 
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/component_updater/component_updater_service.h"
+#include "chrome/browser/component_updater/pnacl/pnacl_profile_observer.h"
+
 class CommandLine;
-class ComponentUpdateService;
 class Version;
 
 namespace base {
 class DictionaryValue;
 }
 
-// Component update registration for Portable Native Client.
-void RegisterPnaclComponent(ComponentUpdateService* cus,
-                            const CommandLine& command_line);
+// Component installer responsible for Portable Native Client files.
+// Files can be installed to a shared location, or be installed to
+// a per-user location.
+class PnaclComponentInstaller : public ComponentInstaller {
+ public:
+  PnaclComponentInstaller();
+
+  virtual ~PnaclComponentInstaller();
+
+  virtual void OnUpdateError(int error) OVERRIDE;
+
+  virtual bool Install(base::DictionaryValue* manifest,
+                       const base::FilePath& unpack_path) OVERRIDE;
+
+  void RegisterPnaclComponent(ComponentUpdateService* cus,
+                              const CommandLine& command_line);
+
+  // Check the PNaCl version again and re-register with the component
+  // updater service.
+  void ReRegisterPnacl();
+
+  bool per_user() const { return per_user_; }
+
+  Version current_version() const { return current_version_; }
+
+  void set_current_version(const Version& v) { current_version_ = v; }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PnaclComponentInstaller);
+  bool per_user_;
+  scoped_ptr<PnaclProfileObserver> profile_observer_;
+  Version current_version_;
+  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_