Adding instrumentation to locate the source of jankiness.

components/policy/core/common/cloud/device_management_service.cc

Index: components/policy/core/common/cloud/device_management_service.cc
diff --git a/components/policy/core/common/cloud/device_management_service.cc b/components/policy/core/common/cloud/device_management_service.cc
index da9b53e903a113844aa621425186073e3e7a7c55..b05cda75a2b61a015f03fb2818095c5c81dbff76 100644
--- a/components/policy/core/common/cloud/device_management_service.cc
+++ b/components/policy/core/common/cloud/device_management_service.cc
@@ -10,6 +10,7 @@
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/profiler/scoped_profile.h"
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
@@ -480,6 +481,11 @@ std::string DeviceManagementService::GetServerUrl() {
 
 void DeviceManagementService::OnURLFetchComplete(
     const net::URLFetcher* source) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/422577 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422577 DeviceManagementService::OnURLFetchComplete"));
+
   JobFetcherMap::iterator entry(pending_jobs_.find(source));
   if (entry == pending_jobs_.end()) {
     NOTREACHED() << "Callback from foreign URL fetcher";