PlzNavigate: add initial traces for new TBM benchmarks.

content/browser/loader/navigation_url_loader_impl_core.cc

Index: content/browser/loader/navigation_url_loader_impl_core.cc
diff --git a/content/browser/loader/navigation_url_loader_impl_core.cc b/content/browser/loader/navigation_url_loader_impl_core.cc
index 05d4b654efd8f0b9d601f2f2bff8f8ecd2ec39bc..b1276e6bb54d3af4fe4228362375764ef73fb412 100644
--- a/content/browser/loader/navigation_url_loader_impl_core.cc
+++ b/content/browser/loader/navigation_url_loader_impl_core.cc
@@ -65,6 +65,7 @@ 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.
   //
@@ -75,12 +76,24 @@ void NavigationURLLoaderImplCore::NotifyRequestRedirected(
       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
@@ -100,6 +113,10 @@ void NavigationURLLoaderImplCore::NotifyResponseStarted(
 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,