Keep AudioSourceNode from premature GC with ScriptWrappable::hasPendingActivity()

third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.cpp

 /*
  * Copyright (C) 2010, Google 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 772 matching lines @@
     ASSERT(isMainThread());
     AutoLocker locker(this);
 
     m_activeSourceNodes.append(node);
     node->handler().makeConnection();
 }
 
 void AbstractAudioContext::releaseActiveSourceNodes()
 {
     ASSERT(isMainThread());
-    for (auto& sourceNode : m_activeSourceNodes)
+    AutoLocker locker(this);
+
+    for (AudioNode* sourceNode : m_activeSourceNodes) {
+        // When the execution context is tearing down, we need to mark all the
+        // active scheduled source nodes (i.e. Oscillator, BufferSource) as
+        // 'available for GC' so they can be collected properly.
+        if (sourceNode->handler().nodeType() == AudioHandler::NodeTypeOscillator
+            || sourceNode->handler().nodeType() == AudioHandler::NodeTypeAudioBufferSource) {
+            AudioScheduledSourceNode* scheduledSourceNode = static_cast<AudioScheduledSourceNode*>(sourceNode);
+            scheduledSourceNode->markForGC();
+        }
+
         sourceNode->handler().breakConnection();
+    }
 
     m_activeSourceNodes.clear();
 }
 
 void AbstractAudioContext::handleStoppableSourceNodes()
 {
     ASSERT(isGraphOwner());
 
     // Find AudioBufferSourceNodes to see if we can stop playing them.
     for (AudioNode* node : m_activeSourceNodes) {
@@ skipping 142 matching lines @@
 SecurityOrigin* AbstractAudioContext::securityOrigin() const
 {
     if (executionContext())
         return executionContext()->securityOrigin();
 
     return nullptr;
 }
 
 } // namespace blink