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

content/browser/service_worker/embedded_worker_instance.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/browser/service_worker/embedded_worker_instance.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind_helpers.h"
+#include "base/debug/trace_event.h"
 #include "content/browser/devtools/embedded_worker_devtools_manager.h"
 #include "content/browser/service_worker/embedded_worker_registry.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/common/service_worker/embedded_worker_messages.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "ipc/ipc_message.h"
 #include "url/gurl.h"
 
@@ skipping 108 matching lines @@
                                    const std::vector<int>& possible_process_ids,
                                    const StatusCallback& callback) {
   if (!context_) {
     callback.Run(SERVICE_WORKER_ERROR_ABORT);
     return;
   }
   DCHECK(status_ == STOPPED);
   status_ = STARTING;
   scoped_ptr<EmbeddedWorkerMsg_StartWorker_Params> params(
       new EmbeddedWorkerMsg_StartWorker_Params());
+  TRACE_EVENT_ASYNC_BEGIN2("ServiceWorker",
+                           "EmbeddedWorkerInstance::ProcessAllocate",
+                           params.get(),
+                           "Scope", scope.spec(),
+                           "Script URL", script_url.spec());
   params->embedded_worker_id = embedded_worker_id_;
   params->service_worker_version_id = service_worker_version_id;
   params->scope = scope;
   params->script_url = script_url;
   params->worker_devtools_agent_route_id = MSG_ROUTING_NONE;
   params->pause_after_download = pause_after_download;
   params->wait_for_debugger = false;
   context_->process_manager()->AllocateWorkerProcess(
       embedded_worker_id_,
       SortProcesses(possible_process_ids),
@@ skipping 92 matching lines @@
     ServiceWorkerStatusCode status) {
   DCHECK_EQ(process_id_, -1);
   if (status != SERVICE_WORKER_OK) {
     status_ = STOPPED;
     callback.Run(status);
     return;
   }
   const int64 service_worker_version_id = params->service_worker_version_id;
   process_id_ = process_id;
   GURL script_url(params->script_url);
+  TRACE_EVENT_ASYNC_END1("ServiceWorker",
+                         "EmbeddedWorkerInstance::ProcessAllocate",
+                         params.get(),
+                         "Status", status);
   RegisterToWorkerDevToolsManager(
       process_id,
       context_.get(),
       context_,
       service_worker_version_id,
       script_url,
       base::Bind(&EmbeddedWorkerInstance::SendStartWorker,
                  weak_factory_.GetWeakPtr(),
                  base::Passed(&params),
                  callback));
@@ skipping 111 matching lines @@
   // Sort descending by the reference count.
   std::sort(counted.begin(), counted.end(), SecondGreater());
 
   std::vector<int> result(counted.size());
   for (size_t i = 0; i < counted.size(); ++i)
     result[i] = counted[i].first;
   return result;
 }
 
 }  // namespace content