Defer media loading while on cellular networks.

third_party/WebKit/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 86 matching lines @@
         observerList->zeroedObservers.append(index);
     }
 
     if (!observerList->iterating && !observerList->zeroedObservers.isEmpty())
         collectZeroedObservers(observerList, context);
 }
 
 void NetworkStateNotifier::setTestUpdatesOnly(bool updatesOnly)
 {
     ASSERT(isMainThread());
+    MutexLocker locker(m_mutex);
+
+    // Reset state to default when entering or leaving test mode.
+    if (updatesOnly != m_testUpdatesOnly) {
+        m_isOnLine = true;
+        m_type = WebConnectionTypeOther;
+        m_maxBandwidthMbps = std::numeric_limits<double>::infinity();
+    }
+
     m_testUpdatesOnly = updatesOnly;
 }
 
 void NetworkStateNotifier::setWebConnectionForTest(WebConnectionType type, double maxBandwidthMbps)
 {
     ASSERT(isMainThread());
     ASSERT(m_testUpdatesOnly);
     setWebConnectionImpl(type, maxBandwidthMbps);
 }
 
@@ skipping 56 matching lines @@
 
     list->zeroedObservers.clear();
 
     if (list->observers.isEmpty()) {
         MutexLocker locker(m_mutex);
         m_observers.remove(context); // deletes list
     }
 }
 
 } // namespace blink