Media controls refer to less magic state.

third_party/WebKit/Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 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.
@@ skipping 2543 matching lines @@
 {
     Document* document = contextDocument();
     if (!document) {
         exceptionState.throwDOMException(InvalidAccessError, "No context document is available.");
         return 0;
     }
 
     return document->loader()->timing().monotonicTimeToZeroBasedDocumentTime(platformTime);
 }
 
+void Internals::setMediaElementNetworkState(HTMLMediaElement* mediaElement, long state)
+{
+    ASSERT(mediaElement);
+    ASSERT(state >= HTMLMediaElement::NetworkState::NETWORK_EMPTY);
+    ASSERT(state <= HTMLMediaElement::NetworkState::NETWORK_NO_SOURCE);
+    mediaElement->setNetworkState(static_cast<WebMediaPlayer::NetworkState>(state));
+}
+
 } // namespace blink