Added ActivityLog tests and associated bugfixes/extra logging.

chrome/browser/extensions/event_router.cc

Index: chrome/browser/extensions/event_router.cc
diff --git a/chrome/browser/extensions/event_router.cc b/chrome/browser/extensions/event_router.cc
index 4a75636f9fd65c20d207b35fc239af8a79425825..818dbadb8cf5faae15574728c7e119555db1b22f 100644
--- a/chrome/browser/extensions/event_router.cc
+++ b/chrome/browser/extensions/event_router.cc
@@ -236,6 +236,10 @@ void EventRouter::OnListenerAdded(const EventListener* listener) {
   if (observer != observers_.end())
     observer->second->OnListenerAdded(details);
 
+#if 0
+  // TODO(felt): Experimentally determine if these are needed, or if they
+  // can be permanently removed. Temporarily removing for now to reduce log
+  // size while under investigation.
   const Extension* extension = extensions::ExtensionSystem::Get(profile_)->
       extension_service()->GetExtensionById(listener->extension_id,
                                             ExtensionService::INCLUDE_ENABLED);
@@ -248,6 +252,7 @@ void EventRouter::OnListenerAdded(const EventListener* listener) {
                                 args.get(),
                                 "");
   }
+#endif
 }
 
 void EventRouter::OnListenerRemoved(const EventListener* listener) {
@@ -265,7 +270,10 @@ void EventRouter::OnListenerRemoved(const EventListener* listener) {
       BrowserThread::IO, FROM_HERE,
       base::Bind(&NotifyEventListenerRemovedOnIOThread,
                  profile, listener->extension_id, event_name));
-
+#if 0
+  // TODO(felt): Experimentally determine if these are needed, or if they
+  // can be permanently removed. Temporarily removing for now to reduce log
+  // size while under investigation.
   const Extension* extension = extensions::ExtensionSystem::Get(profile_)->
       extension_service()->GetExtensionById(listener->extension_id,
                                             ExtensionService::INCLUDE_ENABLED);
@@ -276,6 +284,7 @@ void EventRouter::OnListenerRemoved(const EventListener* listener) {
                                 args.get(),
                                 "");
   }
+#endif
 }
 
 void EventRouter::AddLazyEventListener(const std::string& event_name,