Update from https://crrev.com/307330

net/proxy/proxy_script_decider.cc

Index: net/proxy/proxy_script_decider.cc
diff --git a/net/proxy/proxy_script_decider.cc b/net/proxy/proxy_script_decider.cc
index 939f7af1422a413fa5fd8a140b308d04e0843af6..47e6ca85b0593b3c500a74ad859fb9f6f4f86291 100644
--- a/net/proxy/proxy_script_decider.cc
+++ b/net/proxy/proxy_script_decider.cc
@@ -10,6 +10,7 @@
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
@@ -164,6 +165,11 @@ ProxyScriptDecider::PacSourceList ProxyScriptDecider::
 }
 
 void ProxyScriptDecider::OnIOCompletion(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/436634 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "436634 ProxyScriptDecider::OnIOCompletion"));
+
   DCHECK_NE(STATE_NONE, next_state_);
   int rv = DoLoop(result);
   if (rv != ERR_IO_PENDING) {