Force-load a lazy background page whenever an extension is enabled.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 76465a05df4e655c63c0a128e6f5fb5d03f2663f..fe0358d8ab1195c9b8028cee2ee9270cdd6738e7 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -189,6 +189,9 @@ static bool IsSyncableApp(const Extension& extension) {
   return extension.GetSyncType() == Extension::SYNC_TYPE_APP;
 }
 
+static void DoNothing(extensions::ExtensionHost* host) {
+}
+
 }  // namespace
 
 ExtensionService::ExtensionRuntimeData::ExtensionRuntimeData()
@@ -935,6 +938,14 @@ void ExtensionService::EnableExtension(const std::string& extension_id) {
   extensions_.Insert(make_scoped_refptr(extension));
   disabled_extensions_.Remove(extension->id());
 
+  // If the extension has a lazy background page, make sure it gets loaded to

[Matt Perry, 2012/11/29 20:24:46]

ExtensionService is not the best place for this code. Better to have a system
listen to NOTIFICATION_EXTENSION_ENABLED and do it there. EventRouter seems like
the best fit.

[Marijn Kruisselbrink, 2012/11/29 21:07:19]

Ah yes, of course. Done.

+  // discover which events the extension wants to listen to.
+  if (extension->has_lazy_background_page()) {
+    extensions::LazyBackgroundTaskQueue* queue =
+        system_->lazy_background_task_queue();
+    queue->AddPendingTask(profile_, extension->id(), base::Bind(&DoNothing));
+  }
+
   NotifyExtensionLoaded(extension);
 
   // Notify listeners that the extension was enabled.