Set up the infrastructure for Extension event metrics.

chrome/browser/ui/ash/ash_keyboard_controller_proxy.cc

 // Copyright (c) 2013 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/ui/ash/ash_keyboard_controller_proxy.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/shell.h"
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
@@ skipping 76 matching lines @@
 
     scoped_ptr<base::ListValue> event_args(new base::ListValue());
     scoped_ptr<base::DictionaryValue> new_bounds(new base::DictionaryValue());
     new_bounds->SetInteger("left", bounds.x());
     new_bounds->SetInteger("top", bounds.y());
     new_bounds->SetInteger("width", bounds.width());
     new_bounds->SetInteger("height", bounds.height());
     event_args->Append(new_bounds.release());
 
     scoped_ptr<extensions::Event> event(new extensions::Event(
+        extensions::events::UNKNOWN,
         virtual_keyboard_private::OnBoundsChanged::kEventName,
         event_args.Pass()));
     event->restrict_to_browser_context = context_;
     router->BroadcastEvent(event.Pass());
   }
 
  private:
   content::BrowserContext* context_;
 
   DISALLOW_COPY_AND_ASSIGN(AshKeyboardControllerObserver);
@@ skipping 87 matching lines @@
   }
 
   scoped_ptr<base::ListValue> event_args(new base::ListValue());
   scoped_ptr<base::DictionaryValue> input_context(new base::DictionaryValue());
   input_context->SetString("type",
                            virtual_keyboard_private::ToString(
                                TextInputTypeToGeneratedInputTypeEnum(type)));
   event_args->Append(input_context.release());
 
   scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::events::UNKNOWN,
       virtual_keyboard_private::OnTextInputBoxFocused::kEventName,
       event_args.Pass()));
   event->restrict_to_browser_context = browser_context();
   router->DispatchEventToExtension(kVirtualKeyboardExtensionID, event.Pass());
 }