Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/extension_keybinding_registry.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/extensions/extension_keybinding_registry.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/active_tab_permission_granter.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/command.h"
@@ skipping 102 matching lines @@
   // not set the delegate as it deals only with named commands (not page/browser
   // actions that are associated with the current page directly).
   ActiveTabPermissionGranter* granter =
       delegate_ ? delegate_->GetActiveTabPermissionGranter() : NULL;
   if (granter)
     granter->GrantIfRequested(extension);
 
   scoped_ptr<base::ListValue> args(new base::ListValue());
   args->Append(new base::StringValue(command));
 
-  scoped_ptr<Event> event(new Event(kOnCommandEventName, args.Pass()));
+  scoped_ptr<Event> event(
+      new Event(events::UNKNOWN, kOnCommandEventName, args.Pass()));
   event->restrict_to_browser_context = browser_context_;
   event->user_gesture = EventRouter::USER_GESTURE_ENABLED;
   EventRouter::Get(browser_context_)
       ->DispatchEventToExtension(extension_id, event.Pass());
 }
 
 bool ExtensionKeybindingRegistry::IsAcceleratorRegistered(
     const ui::Accelerator& accelerator) const {
   return event_targets_.find(accelerator) != event_targets_.end();
 }
@@ skipping 120 matching lines @@
     if (extension_id.empty() || it->first == extension_id) {
       CommandExecuted(it->first, it->second);
       executed = true;
     }
   }
 
   return executed;
 }
 
 }  // namespace extensions