Add TRACE_EVENT macros to net.

content/browser/loader/resource_loader.cc

Index: content/browser/loader/resource_loader.cc
diff --git a/content/browser/loader/resource_loader.cc b/content/browser/loader/resource_loader.cc
index 8a9ece1647a4e916ff46cd1f5bb51ea850987b2d..a3b897a4cc214f94609cfdca2676cbff3349562b 100644
--- a/content/browser/loader/resource_loader.cc
+++ b/content/browser/loader/resource_loader.cc
@@ -13,6 +13,7 @@
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
 #include "content/browser/appcache/appcache_interceptor.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/loader/cross_site_resource_handler.h"
@@ -245,6 +246,8 @@ void ResourceLoader::ClearLoginDelegate() {
 void ResourceLoader::OnReceivedRedirect(net::URLRequest* unused,
                                         const net::RedirectInfo& redirect_info,
                                         bool* defer) {
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("net"),
+               "ResourceLoader::OnReceivedRedirect");
   DCHECK_EQ(request_.get(), unused);
 
   DVLOG(1) << "OnReceivedRedirect: " << request_->url().spec();
@@ -330,6 +333,8 @@ void ResourceLoader::OnSSLCertificateError(net::URLRequest* request,
 
 void ResourceLoader::OnBeforeNetworkStart(net::URLRequest* unused,
                                           bool* defer) {
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("net"),
+               "ResourceLoader::OnBeforeNetworkStart");
   DCHECK_EQ(request_.get(), unused);
 
   // Give the handler a chance to delay the URLRequest from using the network.
@@ -342,6 +347,8 @@ void ResourceLoader::OnBeforeNetworkStart(net::URLRequest* unused,
 }
 
 void ResourceLoader::OnResponseStarted(net::URLRequest* unused) {
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("net"),
+               "ResourceLoader::OnResponseStarted");
   DCHECK_EQ(request_.get(), unused);
 
   DVLOG(1) << "OnResponseStarted: " << request_->url().spec();
@@ -363,6 +370,8 @@ void ResourceLoader::OnResponseStarted(net::URLRequest* unused) {
 }
 
 void ResourceLoader::OnReadCompleted(net::URLRequest* unused, int bytes_read) {
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("net"),
+               "ResourceLoader::OnReadCompleted");
   DCHECK_EQ(request_.get(), unused);
   DVLOG(1) << "OnReadCompleted: \"" << request_->url().spec() << "\""
            << " bytes_read = " << bytes_read;
@@ -608,6 +617,7 @@ void ResourceLoader::ReadMore(int* bytes_read) {
     // TODO(darin): Remove ScopedTracker below once crbug.com/475761 is fixed.
     tracked_objects::ScopedTracker tracking_profile2(
         FROM_HERE_WITH_EXPLICIT_FUNCTION("475761 OnWillRead()"));
+    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("net"), "ResourceLoader::ReadMore");
 
     if (!handler_->OnWillRead(&buf, &buf_size, -1)) {
       Cancel();