Add EME Layout test for unclosed the key session

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

Index: third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
diff --git a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
index 86a5f8bc181d1d84f3a6dfdadc2fb14cb614dc42..95ce24493b5abf362763df91f7469b82e81bce76 100644
--- a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
+++ b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
@@ -1033,6 +1033,19 @@ bool MediaKeySession::hasPendingActivity() const {
 }
 
 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;