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

chrome/browser/ui/browser_init.cc

Index: chrome/browser/ui/browser_init.cc
diff --git a/chrome/browser/ui/browser_init.cc b/chrome/browser/ui/browser_init.cc
index 6d2bc1e91253e745a9393e2ae0cc8bf898564206..4b343d22ad8ccb4df937f7a92fb79b20017b4197 100644
--- a/chrome/browser/ui/browser_init.cc
+++ b/chrome/browser/ui/browser_init.cc
@@ -28,6 +28,7 @@
 #include "chrome/browser/component_updater/component_updater_service.h"
 #include "chrome/browser/component_updater/flash_component_installer.h"
 #include "chrome/browser/component_updater/recovery_component_installer.h"
+#include "chrome/browser/component_updater/pnacl/pnacl_component_installer.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/extension_creator.h"
@@ -490,6 +491,11 @@ void RegisterComponentsForUpdate(const CommandLine& command_line) {
   if (command_line.HasSwitch(switches::kEnableCRLSets))
     g_browser_process->crl_set_fetcher()->StartInitialLoad(cus);
 
+  // This developer version of Pnacl should only be installed for developers.
+  if (command_line.HasSwitch(switches::kEnablePnacl)) {
+    RegisterPnaclComponent(cus);
+  }
+
   cus->Start();
 }