Instrumenting URLRequestJob::ReadRawDataHelper for jank.

net/url_request/url_request_job.cc

Index: net/url_request/url_request_job.cc
diff --git a/net/url_request/url_request_job.cc b/net/url_request/url_request_job.cc
index 2deb0f5adf74dc0a9c13b5147c35a3d2954b7b8c..2be8a74c3c36c950fb76c47d1663b98a8921a674 100644
--- a/net/url_request/url_request_job.cc
+++ b/net/url_request/url_request_job.cc
@@ -834,6 +834,11 @@ bool URLRequestJob::ReadRawDataHelper(IOBuffer* buf, int buf_size,
   bool rv = ReadRawData(buf, buf_size, bytes_read);
 
   if (!request_->status().is_io_pending()) {
+    // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
+    tracked_objects::ScopedTracker tracking_profile1(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION(
+            "423948 URLRequestJob::ReadRawDataHelper1"));
+
     // If the read completes synchronously, either success or failure,
     // invoke the OnRawReadComplete callback so we can account for the
     // completed read.
@@ -875,8 +880,14 @@ void URLRequestJob::RecordBytesRead(int bytes_read) {
            << " pre total = " << prefilter_bytes_read_
            << " post total = " << postfilter_bytes_read_;
   UpdatePacketReadTimes();  // Facilitate stats recording if it is active.
-  if (network_delegate_)
+  if (network_delegate_) {
+    // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
+    tracked_objects::ScopedTracker tracking_profile(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION(
+            "423948 URLRequestJob::RecordBytesRead NotifyRawBytesRead"));
+
     network_delegate_->NotifyRawBytesRead(*request_, bytes_read);
+  }
 }
 
 bool URLRequestJob::FilterHasData() {