[Not for review] Add traces for crbug.com/726626

content/renderer/service_worker/service_worker_context_client.cc

 // Copyright 2015 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/service_worker_context_client.h"
 
 #include <map>
 #include <memory>
 #include <utility>
 
@@ skipping 382 matching lines @@
 
 class ServiceWorkerContextClient::NavigationPreloadRequest final
     : public mojom::URLLoaderClient {
  public:
   NavigationPreloadRequest(int fetch_event_id,
                            const GURL& url,
                            mojom::FetchEventPreloadHandlePtr preload_handle)
       : fetch_event_id_(fetch_event_id),
         url_(url),
         url_loader_(std::move(preload_handle->url_loader)),
-        binding_(this, std::move(preload_handle->url_loader_client_request)) {}
+        binding_(this, std::move(preload_handle->url_loader_client_request)) {
+    TRACE_EVENT0("ServiceWorker",
+                 "NavigationPreloadRequest::NavigationPreloadRequest");
+  }
 
   ~NavigationPreloadRequest() override {}
 
   void OnReceiveResponse(
       const ResourceResponseHead& response_head,
       const base::Optional<net::SSLInfo>& ssl_info,
       mojom::DownloadedTempFilePtr downloaded_file) override {
+    TRACE_EVENT0("ServiceWorker",
+                 "NavigationPreloadRequest::OnReceiveResponse");
     DCHECK(!response_);
     DCHECK(!downloaded_file);
     response_ = base::MakeUnique<blink::WebURLResponse>();
     // TODO(horo): Set report_security_info to true when DevTools is attached.
     const bool report_security_info = false;
     WebURLLoaderImpl::PopulateURLResponse(url_, response_head, response_.get(),
                                           report_security_info);
     MaybeReportResponseToClient();
   }
 
@@ skipping 30 matching lines @@
     NOTREACHED();
   }
 
   void OnReceiveCachedMetadata(const std::vector<uint8_t>& data) override {}
 
   void OnTransferSizeUpdated(int32_t transfer_size_diff) override {
   }
 
   void OnStartLoadingResponseBody(
       mojo::ScopedDataPipeConsumerHandle body) override {
+    TRACE_EVENT0("ServiceWorker",
+                 "NavigationPreloadRequest::OnStartLoadingResponseBody");
     DCHECK(!body_.is_valid());
     body_ = std::move(body);
     MaybeReportResponseToClient();
   }
 
   void OnComplete(const ResourceRequestCompletionStatus& status) override {
+    TRACE_EVENT0("ServiceWorker", "NavigationPreloadRequest::OnComplete");
     if (status.error_code != net::OK) {
       std::string message;
       std::string unsanitized_message;
       if (status.error_code == net::ERR_ABORTED) {
         message =
             "The service worker navigation preload request was cancelled "
             "before 'preloadResponse' settled. If you intend to use "
             "'preloadResponse', use waitUntil() or respondWith() to wait for "
             "the promise to settle.";
       } else {
@@ skipping 1212 matching lines @@
 }
 
 base::WeakPtr<ServiceWorkerContextClient>
 ServiceWorkerContextClient::GetWeakPtr() {
   DCHECK(worker_task_runner_->RunsTasksInCurrentSequence());
   DCHECK(context_);
   return context_->weak_factory.GetWeakPtr();
 }
 
 }  // namespace content