Add trace code to track all posted tasks in message_loop.

chrome/browser/sync/profile_sync_service.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 271 matching lines @@
   // single thread. If we want multiple threads to access this(and there is
   // currently no need to do so) we need to protect this with a lock.
   // TODO(timsteele): What happens if the bookmark model is loaded, a change
   // takes place, and the backend isn't initialized yet?
   bool sync_initialized() const { return backend_initialized_; }
   virtual bool unrecoverable_error_detected() const;
   const std::string& unrecoverable_error_message() {
     return unrecoverable_error_message_;
   }
   tracked_objects::Location unrecoverable_error_location() {
-    return unrecoverable_error_location_.get() ?
-        *unrecoverable_error_location_.get() : tracked_objects::Location();
+    return unrecoverable_error_location_;
   }
 
   bool UIShouldDepictAuthInProgress() const {
     return is_auth_in_progress_;
   }
 
   // Returns true if OnPassphraseRequired has been called for any reason.
   bool IsPassphraseRequired() const {
     return passphrase_required_reason_ !=
         sync_api::REASON_PASSPHRASE_NOT_REQUIRED;
@@ skipping 295 matching lines @@
   // Encapsulates user signin with TokenService.
   scoped_ptr<SigninManager> signin_;
 
   // True if an unrecoverable error (e.g. violation of an assumed invariant)
   // occurred during syncer operation.  This value should be checked before
   // doing any work that might corrupt things further.
   bool unrecoverable_error_detected_;
 
   // A message sent when an unrecoverable error occurred.
   std::string unrecoverable_error_message_;
-  scoped_ptr<tracked_objects::Location> unrecoverable_error_location_;
+  tracked_objects::Location unrecoverable_error_location_;
 
   // Manages the start and stop of the various data types.
   scoped_ptr<browser_sync::DataTypeManager> data_type_manager_;
 
   ObserverList<Observer> observers_;
 
   browser_sync::SyncJsController sync_js_controller_;
 
   NotificationRegistrar registrar_;
 
@@ skipping 48 matching lines @@
   browser_sync::SyncProtocolError last_actionable_error_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const browser_sync::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_