Add an API to component_updater that asks to do an update check "now".

chrome/browser/component_updater/pnacl/pnacl_component_installer.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 "chrome/browser/component_updater/pnacl/pnacl_component_installer.h"
 
 #include <string.h>
 
 #include "base/base_paths.h"
 #include "base/bind.h"
@@ skipping 51 matching lines @@
   // choice, which would require substantial refactoring.
   return "arm";
 #elif defined(ARCH_CPU_MIPSEL)
   return "mips32";
 #else
 #error "Add support for your architecture to Pnacl Component Installer."
 #endif
 }
 
 // If we don't have Pnacl installed, this is the version we claim.
-// TODO(jvoung): Is there a way to trick the configurator to ping the server
-// earlier if there are components that are not yet installed (version 0.0.0.0),
-// So that they will be available ASAP? Be careful not to hurt startup speed.
-// Make kNullVersion part of ComponentUpdater in that case, to avoid skew?
 const char kNullVersion[] = "0.0.0.0";
 
 // Pnacl components have the version encoded in the path itself:
 // <profile>\AppData\Local\Google\Chrome\User Data\Pnacl\0.1.2.3\.
 // and the base directory will be:
 // <profile>\AppData\Local\Google\Chrome\User Data\Pnacl\.
 FilePath GetPnaclBaseDirectory() {
   FilePath result;
   CHECK(PathService::Get(chrome::DIR_PNACL_BASE, &result));
   return result;
@@ skipping 210 matching lines @@
   }
 }
 
 }  // namespace
 
 void RegisterPnaclComponent(ComponentUpdateService* cus) {
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&StartPnaclUpdateRegistration, cus));
 }