Add EME Layout test for unclosed the key session

third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp

 /*
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1015 matching lines @@
       << (m_asyncEventQueue->hasPendingEvents()
               ? " m_asyncEventQueue->hasPendingEvents()"
               : "")
       << ((m_mediaKeys && !m_isClosed) ? " m_mediaKeys && !m_isClosed" : "");
 
   return !m_pendingActions.isEmpty() || m_asyncEventQueue->hasPendingEvents() ||
          (m_mediaKeys && !m_isClosed);
 }
 
 void MediaKeySession::contextDestroyed() {
+  DVLOG(MEDIA_KEY_SESSION_LOG_LEVEL) << __func__ << "(" << this << ")";
+
+  // If call contextDestroyed before close session,
+  // clear session without closeTask.
+  // So call closeTask if there is a delayed pendingAction::Close.

[haraken, 2016/11/01 07:21:38]

// When the context is destroyed, we need to close a pending action with
PendingAction::Close.

+  while (!m_pendingActions.isEmpty()) {
+    PendingAction* action = m_pendingActions.takeFirst();
+    if (action->getType() == PendingAction::Close) {
+      closeTask(action->result());
+      break;

[haraken, 2016/11/01 06:56:15]

Sorry, would you explain why we need 'break' here? What happens if we have more
than one tasks with PendingAction::Close?

[Dongheun Kang, 2016/11/01 07:09:29]

I think can't add duplicated close action in pendingAction.
And I don't need to call close in same key session. Once a call closeTask is
enough.

+    }
+  }
+
   // Stop the CDM from firing any more events for this session.
   m_session.reset();
   m_isClosed = true;
   m_actionTimer.stop();
   m_pendingActions.clear();
   m_asyncEventQueue->close();
 }
 
 DEFINE_TRACE(MediaKeySession) {
   visitor->trace(m_asyncEventQueue);
   visitor->trace(m_pendingActions);
   visitor->trace(m_mediaKeys);
   visitor->trace(m_keyStatusesMap);
   visitor->trace(m_closedPromise);
   EventTargetWithInlineData::trace(visitor);
   ActiveDOMObject::trace(visitor);
 }
 
 }  // namespace blink