Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/streams_private/streams_private_api.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/api/streams_private/streams_private_api.h"
 
 #include "base/lazy_instance.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/common/extensions/api/streams_private.h"
@@ skipping 92 matching lines @@
   }
 
   int size = -1;
   if (expected_content_size <= INT_MAX)
     size = expected_content_size;
   info.expected_content_size = size;
 
   CreateResponseHeadersDictionary(stream->response_headers.get(),
                                   &info.response_headers.additional_properties);
 
-  scoped_ptr<Event> event(
-      new Event(streams_private::OnExecuteMimeTypeHandler::kEventName,
-                streams_private::OnExecuteMimeTypeHandler::Create(info)));
+  scoped_ptr<Event> event(new Event(
+      events::UNKNOWN, streams_private::OnExecuteMimeTypeHandler::kEventName,
+      streams_private::OnExecuteMimeTypeHandler::Create(info)));
 
   EventRouter::Get(browser_context_)
       ->DispatchEventToExtension(extension_id, event.Pass());
 
   GURL url = stream->handle->GetURL();
   streams_[extension_id][url] = make_linked_ptr(stream->handle.release());
 }
 
 void StreamsPrivateAPI::AbortStream(const std::string& extension_id,
                                     const GURL& stream_url,
@@ skipping 42 matching lines @@
 static base::LazyInstance<BrowserContextKeyedAPIFactory<StreamsPrivateAPI> >
     g_factory = LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<StreamsPrivateAPI>*
 StreamsPrivateAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 }  // namespace extensions