Deprecate subscriptions to MediaStream ended event

third_party/WebKit/Source/modules/mediastream/MediaStream.cpp

 /*
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  * Copyright (C) 2011, 2012 Ericsson AB. All rights reserved.
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  * modification, are permitted provided that the following conditions
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 #include "modules/mediastream/MediaStream.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/frame/UseCounter.h"
 #include "modules/mediastream/MediaStreamRegistry.h"
 #include "modules/mediastream/MediaStreamTrackEvent.h"
 #include "platform/mediastream/MediaStreamCenter.h"
 #include "platform/mediastream/MediaStreamSource.h"
 
 namespace blink {
 
 static bool containsSource(MediaStreamTrackVector& trackVector, MediaStreamSource* source)
 {
     for (size_t i = 0; i < trackVector.size(); ++i) {
@@ skipping 254 matching lines @@
         scheduleDispatchEvent(Event::create(EventTypeNames::inactive));
     }
 
     // TODO(guidou): remove firing of this event. See crbug.com/586924
     if (!m_descriptor->ended()) {
         m_descriptor->setEnded();
         scheduleDispatchEvent(Event::create(EventTypeNames::ended));
     }
 }
 
+bool MediaStream::addEventListenerInternal(const AtomicString& eventType, EventListener* listener, const EventListenerOptions& options)
+{
+    if (eventType == EventTypeNames::ended)
+        UseCounter::count(getExecutionContext(), UseCounter::MediaStreamOnEnded);
+
+    return EventTarget::addEventListenerInternal(eventType, listener, options);

[Rick Byers, 2016/05/05 14:08:57]

nit: This should probably be
"EventTargetWithInlineData::addEventListenerInternal" since this class inherits
from EventTargetWithInlineData (although there's obviously no difference right
now, but just incase we ever overrode addEventListenerInternal in
EventTargetWithInlineData.

+}
+
 void MediaStream::contextDestroyed()
 {
     ContextLifecycleObserver::contextDestroyed();
     m_stopped = true;
 }
 
 const AtomicString& MediaStream::interfaceName() const
 {
     return EventTargetNames::MediaStream;
 }
@@ skipping 106 matching lines @@
     ContextLifecycleObserver::trace(visitor);
     MediaStreamDescriptorClient::trace(visitor);
 }
 
 MediaStream* toMediaStream(MediaStreamDescriptor* descriptor)
 {
     return static_cast<MediaStream*>(descriptor->client());
 }
 
 } // namespace blink