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..ec9c94a39b9848bb631a1b17d6e9937ec11bfde5 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.