Make sure the Commands list correctly reflects the status of extensions right after install/uninsta…

chrome/browser/ui/webui/extensions/command_handler.cc

Index: chrome/browser/ui/webui/extensions/command_handler.cc
===================================================================
--- chrome/browser/ui/webui/extensions/command_handler.cc	(revision 153186)
+++ chrome/browser/ui/webui/extensions/command_handler.cc	(working copy)
@@ -12,6 +12,7 @@
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/extension_set.h"
 #include "content/public/browser/web_ui.h"
@@ -20,7 +21,7 @@
 
 namespace extensions {
 
-CommandHandler::CommandHandler() {
+CommandHandler::CommandHandler(Profile* profile) : profile_(profile) {
 }
 
 CommandHandler::~CommandHandler() {
@@ -40,6 +41,11 @@
 }
 
 void CommandHandler::RegisterMessages() {
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
+                 content::Source<Profile>(profile_));
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
+                 content::Source<Profile>(profile_));
+
   web_ui()->RegisterMessageCallback("extensionCommandsRequestExtensionsData",
       base::Bind(&CommandHandler::HandleRequestExtensionsData,
       base::Unretained(this)));
@@ -51,6 +57,15 @@
       base::Unretained(this)));
 }
 
+void CommandHandler::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  DCHECK(type == chrome::NOTIFICATION_EXTENSION_LOADED ||
+         type == chrome::NOTIFICATION_EXTENSION_UNLOADED);
+  UpdateCommandDataOnPage();
+}
+
 void CommandHandler::UpdateCommandDataOnPage() {
   DictionaryValue results;
   GetAllCommands(&results);