Instrumenting CopyData to analyze its slowing down

net/url_request/url_request_simple_job.cc

Index: net/url_request/url_request_simple_job.cc
diff --git a/net/url_request/url_request_simple_job.cc b/net/url_request/url_request_simple_job.cc
index 0cd19a6e2aa989f38f00292db1c575cd18918da6..b50bbc8173b0c76bbc1503f2151ef439ff4aea55 100644
--- a/net/url_request/url_request_simple_job.cc
+++ b/net/url_request/url_request_simple_job.cc
@@ -26,6 +26,10 @@ void CopyData(const scoped_refptr<IOBuffer>& buf,
               int buf_size,
               const scoped_refptr<base::RefCountedMemory>& data,
               int64 data_offset) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422489 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("422489 CopyData"));
+
   memcpy(buf->data(), data->front() + data_offset, buf_size);
 }