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..90a156e23b9a32310b9f754eb4c89793f16d8035 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.
   //
@@ -75,11 +76,17 @@ void NavigationURLLoaderImplCore::NotifyRequestRedirected(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&NavigationURLLoaderImpl::NotifyRequestRedirected, loader_,
                  redirect_info, response->DeepCopy()));
+  TRACE_EVENT_ASYNC_BEGIN2("navigation", "Navigation redirectDelay", this,
+                           "&NavigationURLLoaderImplCore", this, "New URL",
+                           redirect_info.new_url.spec());
 }
 
 void NavigationURLLoaderImplCore::NotifyResponseStarted(
     ResourceResponse* response,
     scoped_ptr<StreamHandle> body) {
+  TRACE_EVENT_ASYNC_END0("navigation", "Navigation redirectDelay", this);

[clamy, 2015/12/18 15:42:11]

nit: I would leave the DCHECK_CURRENTLY_ON first. Same below.

[carlosk, 2015/12/18 17:23:21]

Done.

+  TRACE_EVENT_ASYNC_END2("navigation", "Navigation timeToResponseStarted", this,
+                         "&NavigationURLLoaderImplCore", this, "success", true);
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   // If, by the time the task reaches the UI thread, |loader_| has already been
@@ -99,6 +106,10 @@ void NavigationURLLoaderImplCore::NotifyResponseStarted(
 
 void NavigationURLLoaderImplCore::NotifyRequestFailed(bool in_cache,
                                                       int net_error) {
+  TRACE_EVENT_ASYNC_END0("navigation", "Navigation redirectDelay", this);
+  TRACE_EVENT_ASYNC_END2("navigation", "Navigation timeToResponseStarted", this,
+                         "&NavigationURLLoaderImplCore", this, "success",
+                         false);
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   BrowserThread::PostTask(