Add some instrumentation for jank in URLRequest::Start.

Suspect we'll find the jank is pretty spread out, but could be
something actionable.

BUG=456327

Review URL: https://codereview.chromium.org/1102473005

Cr-Commit-Position: refs/heads/master@{#326639}

2 files changed, 22 insertions, 0 deletions

diff --git a/net/url_request/url_request.cc b/net/url_request/url_request.cc
index d78412a..6032c4c 100644
--- a/net/url_request/url_request.cc
+++ b/net/url_request/url_request.cc
@@ -516,6 +516,10 @@ void URLRequest::Start() {
     return;
   }
 
+  // TODO(mmenke): Remove ScopedTracker below once crbug.com/456327 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("456327 URLRequest::Start 2"));
+
   StartJob(URLRequestJobManager::GetInstance()->CreateJob(
       this, network_delegate_));
 }
@@ -589,6 +593,10 @@ void URLRequest::BeforeRequestComplete(int error) {
 }
 
 void URLRequest::StartJob(URLRequestJob* job) {
+  // TODO(mmenke): Remove ScopedTracker below once crbug.com/456327 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("456327 URLRequest::StartJob"));
+
   DCHECK(!is_pending_);
   DCHECK(!job_.get());
 
diff --git a/net/url_request/url_request_http_job.cc b/net/url_request/url_request_http_job.cc
index 88b6a477..114a8bd 100644
--- a/net/url_request/url_request_http_job.cc
+++ b/net/url_request/url_request_http_job.cc
@@ -225,6 +225,10 @@ void URLRequestHttpJob::SetPriority(RequestPriority priority) {
 }
 
 void URLRequestHttpJob::Start() {
+  // TODO(mmenke): Remove ScopedTracker below once crbug.com/456327 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("456327 URLRequestHttpJob::Start"));
+
   DCHECK(!transaction_.get());
 
   // URLRequest::SetReferrer ensures that we do not send username and password
@@ -398,6 +402,11 @@ void URLRequestHttpJob::DestroyTransaction() {
 }
 
 void URLRequestHttpJob::StartTransaction() {
+  // TODO(mmenke): Remove ScopedTracker below once crbug.com/456327 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "456327 URLRequestHttpJob::StartTransaction"));
+
   if (network_delegate()) {
     OnCallToDelegate();
     int rv = network_delegate()->NotifyBeforeSendHeaders(
@@ -421,6 +430,11 @@ void URLRequestHttpJob::NotifyBeforeSendHeadersCallback(int result) {
 }
 
 void URLRequestHttpJob::MaybeStartTransactionInternal(int result) {
+  // TODO(mmenke): Remove ScopedTracker below once crbug.com/456327 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "456327 URLRequestHttpJob::MaybeStartTransactionInternal"));
+
   OnCallToDelegateComplete();
   if (result == OK) {
     StartTransactionInternal();