ServiceWorker: Insert TRACE_EVENT to watch a breakdown of the ServiceWorker's performance on chome:…

content/renderer/service_worker/embedded_worker_dispatcher.cc

 // Copyright 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 "content/renderer/service_worker/embedded_worker_dispatcher.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/child/child_process.h"
@@ skipping 51 matching lines @@
 void EmbeddedWorkerDispatcher::WorkerContextDestroyed(
     int embedded_worker_id) {
   RenderThreadImpl::current()->thread_safe_sender()->Send(
       new EmbeddedWorkerHostMsg_WorkerStopped(embedded_worker_id));
   workers_.Remove(embedded_worker_id);
 }
 
 void EmbeddedWorkerDispatcher::OnStartWorker(
     const EmbeddedWorkerMsg_StartWorker_Params& params) {
   DCHECK(!workers_.Lookup(params.embedded_worker_id));
+  TRACE_EVENT0("ServiceWorker", "EmbeddedWorkerDispatcher::OnStartWorker");
   RenderThread::Get()->EnsureWebKitInitialized();
   scoped_ptr<WorkerWrapper> wrapper(
       new WorkerWrapper(blink::WebEmbeddedWorker::create(
                             new EmbeddedWorkerContextClient(
                                 params.embedded_worker_id,
                                 params.service_worker_version_id,
                                 params.scope,
                                 params.script_url,
                                 params.worker_devtools_agent_route_id),
                             NULL),
@@ skipping 16 matching lines @@
   start_data.startMode =
       params.wait_for_debugger ?
           blink::WebEmbeddedWorkerStartModePauseOnStart :
           blink::WebEmbeddedWorkerStartModeDontPauseOnStart;
 
   wrapper->worker()->startWorkerContext(start_data);
   workers_.AddWithID(wrapper.release(), params.embedded_worker_id);
 }
 
 void EmbeddedWorkerDispatcher::OnStopWorker(int embedded_worker_id) {
+  TRACE_EVENT0("ServiceWorker", "EmbeddedWorkerDispatcher::OnStopWorker");
   WorkerWrapper* wrapper = workers_.Lookup(embedded_worker_id);
   if (!wrapper) {
     LOG(WARNING) << "Got OnStopWorker for nonexistent worker";
     return;
   }
 
   // This should eventually call WorkerContextDestroyed. (We may need to post
   // a delayed task to forcibly abort the worker context if we find it
   // necessary)
   wrapper->worker()->terminateWorkerContext();
 }
 
 void EmbeddedWorkerDispatcher::OnResumeAfterDownload(int embedded_worker_id) {
+  TRACE_EVENT0("ServiceWorker",
+               "EmbeddedWorkerDispatcher::OnResumeAfterDownload");
   WorkerWrapper* wrapper = workers_.Lookup(embedded_worker_id);
   if (!wrapper) {
     LOG(WARNING) << "Got OnResumeAfterDownload for nonexistent worker";
     return;
   }
   wrapper->worker()->resumeAfterDownload();
 }
 
 }  // namespace content