[NOT FOR LANDING] Detailed loading traces

content/browser/loader/throttling_resource_handler.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 "content/browser/loader/throttling_resource_handler.h"
 
 #include <utility>
+#include "base/trace_event/trace_event.h"
 
 #include "content/browser/loader/resource_request_info_impl.h"
 #include "content/public/browser/resource_throttle.h"
 #include "content/public/common/resource_response.h"
 #include "net/url_request/url_request.h"
 
 namespace content {
 
 ThrottlingResourceHandler::ThrottlingResourceHandler(
     scoped_ptr<ResourceHandler> next_handler,
     net::URLRequest* request,
     ScopedVector<ResourceThrottle> throttles)
     : LayeredResourceHandler(request, std::move(next_handler)),
       deferred_stage_(DEFERRED_NONE),
       throttles_(std::move(throttles)),
       next_index_(0),
       cancelled_by_resource_throttle_(false) {
   for (size_t i = 0; i < throttles_.size(); ++i) {
     throttles_[i]->set_controller(this);
     // Throttles must have a name, as otherwise, bugs where a throttle fails
     // to resume a request can be very difficult to debug.
     DCHECK(throttles_[i]->GetNameForLogging());
   }
 }
 
 ThrottlingResourceHandler::~ThrottlingResourceHandler() {
+  TRACE_EVENT0("toplevel",
+               "ThrottlingResourceHandler::~ThrottlingResourceHandler");
 }
 
 bool ThrottlingResourceHandler::OnRequestRedirected(
     const net::RedirectInfo& redirect_info,
     ResourceResponse* response,
     bool* defer) {
   DCHECK(!cancelled_by_resource_throttle_);
 
   *defer = false;
   while (next_index_ < throttles_.size()) {
@@ skipping 10 matching lines @@
       return true;  // Do not cancel.
     }
   }
 
   next_index_ = 0;  // Reset for next time.
 
   return next_handler_->OnRequestRedirected(redirect_info, response, defer);
 }
 
 bool ThrottlingResourceHandler::OnWillStart(const GURL& url, bool* defer) {
+  TRACE_EVENT0("toplevel", "ThrottlingResourceHandler::OnWillStart");
   DCHECK(!cancelled_by_resource_throttle_);
 
   *defer = false;
   while (next_index_ < throttles_.size()) {
     int index = next_index_;
-    throttles_[index]->WillStartRequest(defer);
+    {
+      TRACE_EVENT0("toplevel", "Throttle::OnWillStartRequest");
+      throttles_[index]->WillStartRequest(defer);
+    }
     next_index_++;
     if (cancelled_by_resource_throttle_)
       return false;
     if (*defer) {
-      OnRequestDefered(index);
+      {
+        TRACE_EVENT0("toplevel", "ThrottlingResourceHandler::OnRequestDefered");
+        OnRequestDefered(index);
+      }
       deferred_stage_ = DEFERRED_START;
       deferred_url_ = url;
       return true;  // Do not cancel.
     }
   }
 
   next_index_ = 0;  // Reset for next time.
 
   return next_handler_->OnWillStart(url, defer);
 }
@@ skipping 17 matching lines @@
     }
   }
 
   next_index_ = 0;  // Reset for next time.
 
   return next_handler_->OnBeforeNetworkStart(url, defer);
 }
 
 bool ThrottlingResourceHandler::OnResponseStarted(ResourceResponse* response,
                                                   bool* defer) {
+  TRACE_EVENT0("toplevel", "ThrottlingResourceHandler::OnResponseStarted");
+
   DCHECK(!cancelled_by_resource_throttle_);
 
   while (next_index_ < throttles_.size()) {
     int index = next_index_;
     throttles_[index]->WillProcessResponse(defer);
     next_index_++;
     if (cancelled_by_resource_throttle_)
       return false;
     if (*defer) {
       OnRequestDefered(index);
@@ skipping 105 matching lines @@
   } else if (!defer) {
     controller()->Resume();
   }
 }
 
 void ThrottlingResourceHandler::OnRequestDefered(int throttle_index) {
   request()->LogBlockedBy(throttles_[throttle_index]->GetNameForLogging());
 }
 
 }  // namespace content