Add task location information to ExecutionContext

Source/core/page/NetworkStateNotifier.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 60 matching lines @@
 {
     ASSERT(isMainThread());
 
     MutexLocker locker(m_mutex);
     if (m_type == type)
         return;
     m_type = type;
 
     for (const auto& entry : m_observers) {
         ExecutionContext* context = entry.key;
-        context->postTask(createCrossThreadTask(&NetworkStateNotifier::notifyObserversOnContext, this, AllowCrossThreadAccess(context), type));
+        context->postTask(FROM_HERE, createCrossThreadTask(&NetworkStateNotifier::notifyObserversOnContext, this, AllowCrossThreadAccess(context), type));
     }
 }
 
 void NetworkStateNotifier::addObserver(NetworkStateObserver* observer, ExecutionContext* context)
 {
     ASSERT(context->isContextThread());
     ASSERT(observer);
 
     MutexLocker locker(m_mutex);
     ObserverListMap::AddResult result = m_observers.add(context, nullptr);
@@ skipping 80 matching lines @@
 
     list->zeroedObservers.clear();
 
     if (list->observers.isEmpty()) {
         MutexLocker locker(m_mutex);
         m_observers.remove(context); // deletes list
     }
 }
 
 } // namespace blink