Add queued_time_ms trace for events in message loop

sync/syncable/syncable_base_transaction.cc

Index: sync/syncable/syncable_base_transaction.cc
diff --git a/sync/syncable/syncable_base_transaction.cc b/sync/syncable/syncable_base_transaction.cc
index d068bb9399a688c1c42825dbce8a0bb84a9976d2..69783ca735c5fbc018fc56f20b16a0066d35acd8 100644
--- a/sync/syncable/syncable_base_transaction.cc
+++ b/sync/syncable/syncable_base_transaction.cc
@@ -19,9 +19,8 @@ Id BaseTransaction::root_id() const {
 }
 
 void BaseTransaction::Lock() {
-  TRACE_EVENT2("sync_lock_contention", "AcquireLock",
-               "src_file", from_here_.file_name(),
-               "src_func", from_here_.function_name());
+  TRACE_EVENT1("sync_lock_contention", "AcquireLock",
+               "src", from_here_.ToTraceFormat());
 
   directory_->kernel_->transaction_mutex.Acquire();
 }
@@ -65,9 +64,8 @@ BaseTransaction::BaseTransaction(const tracked_objects::Location& from_here,
   // TODO(lipalani): Don't issue a good transaction if the directory has
   // unrecoverable error set. And the callers have to check trans.good before
   // proceeding.
-  TRACE_EVENT_BEGIN2("sync", name_,
-                     "src_file", from_here_.file_name(),
-                     "src_func", from_here_.function_name());
+  TRACE_EVENT_BEGIN1("sync", name_,
+                     "src", from_here_.ToTraceFormat());
 }
 
 BaseTransaction::~BaseTransaction() {