[NOT FOR LANDING] Detailed loading traces

content/browser/loader/detachable_resource_handler.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/loader/detachable_resource_handler.h"
 
 #include <utility>
-
+#include "base/trace_event/trace_event.h"
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "content/browser/loader/resource_request_info_impl.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_status.h"
 
 namespace {
 // This matches the maximum allocation size of AsyncResourceHandler.
 const int kReadBufSize = 32 * 1024;
 }
 
 namespace content {
 
 DetachableResourceHandler::DetachableResourceHandler(
     net::URLRequest* request,
     base::TimeDelta cancel_delay,
     scoped_ptr<ResourceHandler> next_handler)
     : ResourceHandler(request),
       next_handler_(std::move(next_handler)),
       cancel_delay_(cancel_delay),
       is_deferred_(false),
       is_finished_(false) {
   GetRequestInfo()->set_detachable_handler(this);
 }
 
 DetachableResourceHandler::~DetachableResourceHandler() {
+  TRACE_EVENT0("toplevel",
+               "DetachableResourceHandler::~DetachableResourceHandler");
   // Cleanup back-pointer stored on the request info.
   GetRequestInfo()->set_detachable_handler(NULL);
 }
 
 void DetachableResourceHandler::Detach() {
   if (is_detached())
     return;
 
   if (!is_finished_) {
     // Simulate a cancel on the next handler before destroying it.
@@ skipping 64 matching lines @@
   if (!next_handler_)
     return true;
 
   bool ret =
       next_handler_->OnResponseStarted(response, &is_deferred_);
   *defer = is_deferred_;
   return ret;
 }
 
 bool DetachableResourceHandler::OnWillStart(const GURL& url, bool* defer) {
+  TRACE_EVENT0("toplevel", "DetachableResourceHandler::OnWillStart");
   DCHECK(!is_deferred_);
 
   if (!next_handler_)
     return true;
 
   bool ret = next_handler_->OnWillStart(url, &is_deferred_);
   *defer = is_deferred_;
   return ret;
 }
 
@@ skipping 72 matching lines @@
 
 void DetachableResourceHandler::CancelAndIgnore() {
   controller()->CancelAndIgnore();
 }
 
 void DetachableResourceHandler::CancelWithError(int error_code) {
   controller()->CancelWithError(error_code);
 }
 
 }  // namespace content