Adding instrumentation to locate the source of jankiness.

jingle/glue/proxy_resolving_client_socket.cc

Index: jingle/glue/proxy_resolving_client_socket.cc
diff --git a/jingle/glue/proxy_resolving_client_socket.cc b/jingle/glue/proxy_resolving_client_socket.cc
index 0b35559d5509cf0975f53565e09f32b385294950..916f4178600117b1252d0564d6a61942b5df0783 100644
--- a/jingle/glue/proxy_resolving_client_socket.cc
+++ b/jingle/glue/proxy_resolving_client_socket.cc
@@ -9,6 +9,7 @@
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
+#include "base/profiler/scoped_tracker.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
@@ -214,6 +215,10 @@ void ProxyResolvingClientSocket::ProcessProxyResolveDone(int status) {
 }
 
 void ProxyResolvingClientSocket::ProcessConnectDone(int status) {
+  // TODO(pkasting): Remove ScopedTracker below once crbug.com/455884 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "455884 ProxyResolvingClientSocket::ProcessConnectDone"));
   if (status != net::OK) {
     // If the connection fails, try another proxy.
     status = ReconsiderProxyAfterError(status);