Adding instrumentation to locate the source of jankiness.

net/websockets/websocket_stream.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/websockets/websocket_stream.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/redirect_info.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 #include "net/websockets/websocket_errors.h"
@@ skipping 194 matching lines @@
 
   void ContinueSSLRequest() override {
     url_request_->ContinueDespiteLastError();
   }
 
  private:
   URLRequest* url_request_;
 };
 
 void Delegate::OnResponseStarted(URLRequest* request) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("423948 Delegate::OnResponseStarted"));
+
   // All error codes, including OK and ABORTED, as with
   // Net.ErrorCodesForMainFrame3
   UMA_HISTOGRAM_SPARSE_SLOWLY("Net.WebSocket.ErrorCodes",
                               -request->status().error());
   if (!request->status().is_success()) {
     DVLOG(3) << "OnResponseStarted (request failed)";
     owner_->ReportFailure();
     return;
   }
   const int response_code = request->GetResponseCode();
@@ skipping 112 matching lines @@
     connect_delegate->OnFinishOpeningHandshake(make_scoped_ptr(
         new WebSocketHandshakeResponseInfo(url,
                                            headers->response_code(),
                                            headers->GetStatusText(),
                                            headers,
                                            response_time)));
   }
 }
 
 }  // namespace net