Add trace code to track all posted tasks in message_loop.

chrome/browser/sync/util/logging.cc

Index: chrome/browser/sync/util/logging.cc
diff --git a/chrome/browser/sync/util/logging.cc b/chrome/browser/sync/util/logging.cc
index 2951f8ccaa6d39a61ac99269795222201cc212cc..962fe43f6b313addd1126e63ea91feb071dbb4ae 100644
--- a/chrome/browser/sync/util/logging.cc
+++ b/chrome/browser/sync/util/logging.cc
@@ -10,9 +10,10 @@ namespace browser_sync {
 
 bool VlogIsOnForLocation(const tracked_objects::Location& from_here,
                          int verbose_level) {
+  const base::StringPiece& file = from_here.file_name();
   return (verbose_level <=
           logging::GetVlogLevelHelper(
-              from_here.file_name(), ::strlen(from_here.file_name())));
+              file.data(), file.size() + 1));
 }
 
 }  // namespace browser_sync