PlzNavigate: add initial traces for new TBM benchmarks.

content/browser/loader/navigation_url_loader_impl_core.cc

 // Copyright 2014 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/navigation_url_loader_impl_core.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/navigation_request_info.h"
@@ skipping 47 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   if (resource_handler_)
     resource_handler_->FollowRedirect();
 }
 
 void NavigationURLLoaderImplCore::NotifyRequestRedirected(
     const net::RedirectInfo& redirect_info,
     ResourceResponse* response) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  TRACE_EVENT_ASYNC_END0("navigation", "Navigation redirectDelay", this);
 
   // Make a copy of the ResourceResponse before it is passed to another thread.
   //
   // TODO(davidben): This copy could be avoided if ResourceResponse weren't
   // reference counted and the loader stack passed unique ownership of the
   // response. https://crbug.com/416050
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&NavigationURLLoaderImpl::NotifyRequestRedirected, loader_,
                  redirect_info, response->DeepCopy()));
+  TRACE_EVENT_ASYNC_BEGIN2(
+      // category and name
+      "navigation", "Navigation redirectDelay",
+      // use this NavigationURLLoaderImplCore instance as the async trace id
+      this,
+      // add this instance address as a parameter
+      "&NavigationURLLoaderImplCore", this,

[clamy, 2015/12/21 10:43:32]

Why the & here?
Also as mentioned somewhere else, comments.

[carlosk, 2015/12/21 11:19:25]

Done.

+      // add the redirected URL as a parameter
+      "New URL", redirect_info.new_url.spec());
 }
 
 void NavigationURLLoaderImplCore::NotifyResponseStarted(
     ResourceResponse* response,
     scoped_ptr<StreamHandle> body) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  TRACE_EVENT_ASYNC_END0("navigation", "Navigation redirectDelay", this);
+  TRACE_EVENT_ASYNC_END2("navigation", "Navigation timeToResponseStarted", this,
+                         "&NavigationURLLoaderImplCore", this, "success", true);
 
   // If, by the time the task reaches the UI thread, |loader_| has already been
   // destroyed, NotifyResponseStarted will not run. |body| will be destructed
   // and the request released at that point.
 
   // Make a copy of the ResourceResponse before it is passed to another thread.
   //
   // TODO(davidben): This copy could be avoided if ResourceResponse weren't
   // reference counted and the loader stack passed unique ownership of the
   // response. https://crbug.com/416050
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&NavigationURLLoaderImpl::NotifyResponseStarted, loader_,
                  response->DeepCopy(), base::Passed(&body)));
 }
 
 void NavigationURLLoaderImplCore::NotifyRequestFailed(bool in_cache,
                                                       int net_error) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  TRACE_EVENT_ASYNC_END0("navigation", "Navigation redirectDelay", this);
+  TRACE_EVENT_ASYNC_END2("navigation", "Navigation timeToResponseStarted", this,
+                         "&NavigationURLLoaderImplCore", this, "success",
+                         false);
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&NavigationURLLoaderImpl::NotifyRequestFailed, loader_,
                  in_cache, net_error));
 }
 
 }  // namespace content