Adds ability to prevent browser connection updates in layout tests.

Source/core/page/NetworkStateNotifier.h

 /*
  * 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 31 matching lines @@
 public:
     class NetworkStateObserver {
     public:
         // Will be called on the thread of the context passed in addObserver.
         virtual void connectionTypeChange(blink::WebConnectionType) = 0;
     };
 
     NetworkStateNotifier()
         : m_isOnLine(true)
         , m_type(blink::ConnectionTypeOther)
+        , m_testUpdatesOnly(false)
     {
     }
 
     bool onLine() const
     {
         MutexLocker locker(m_mutex);
         return m_isOnLine;
     }
 
     void setOnLine(bool);
 
     blink::WebConnectionType connectionType() const
     {
         MutexLocker locker(m_mutex);
         return m_type;
     }
 
     void setWebConnectionType(blink::WebConnectionType);
 
     // Must be called on the context's thread. An added observer must be
     // removed before its ExecutionContext is deleted.
     void addObserver(NetworkStateObserver*, ExecutionContext*);
     void removeObserver(NetworkStateObserver*, ExecutionContext*);
 
+    // The following functions are for testing purposes.
+
+    // When true, setWebConnectionType calls are ignored and only setWebConnectionTypeForTest
+    // can update the connection type. This is used for layout tests (see crbug.com/377736).
+    void setTestUpdatesOnly(bool);
+    // Tests should call this as it will change the type regardless of the value of m_testUpdatesOnly.
+    void setWebConnectionTypeForTest(blink::WebConnectionType);
+
 private:
     struct ObserverList {
         ObserverList()
             : iterating(false)
         {
         }
         bool iterating;
         Vector<NetworkStateObserver*> observers;
         Vector<size_t> zeroedObservers; // Indices in observers that are 0.
     };
 
+    void setWebConnectionTypeImpl(blink::WebConnectionType);
+
     typedef HashMap<ExecutionContext*, OwnPtr<ObserverList> > ObserverListMap;
 
     void notifyObserversOnContext(ExecutionContext*, blink::WebConnectionType);
 
     ObserverList* lockAndFindObserverList(ExecutionContext*);
 
     // Removed observers are nulled out in the list in case the list is being
     // iterated over. Once done iterating, call this to clean up nulled
     // observers.
     void collectZeroedObservers(ObserverList*, ExecutionContext*);
 
     mutable Mutex m_mutex;
     bool m_isOnLine;
     blink::WebConnectionType m_type;
     ObserverListMap m_observers;
+    bool m_testUpdatesOnly;
 };
 
 NetworkStateNotifier& networkStateNotifier();
 
 } // namespace WebCore
 
 #endif // NetworkStateNotifier_h