Move webaudio to oilpan

Source/modules/webaudio/ScriptProcessorNode.h

Index: Source/modules/webaudio/ScriptProcessorNode.h
diff --git a/Source/modules/webaudio/ScriptProcessorNode.h b/Source/modules/webaudio/ScriptProcessorNode.h
index 08a187df65576382d6bb8b5c43f893d02af020f8..d6afb822bb1db12374e67e0898bd81f23416f48b 100644
--- a/Source/modules/webaudio/ScriptProcessorNode.h
+++ b/Source/modules/webaudio/ScriptProcessorNode.h
@@ -50,7 +50,7 @@ public:
     // This value controls how frequently the onaudioprocess event handler is called and how many sample-frames need to be processed each call.
     // Lower numbers for bufferSize will result in a lower (better) latency. Higher numbers will be necessary to avoid audio breakup and glitches.
     // The value chosen must carefully balance between latency and audio quality.
-    static PassRefPtr<ScriptProcessorNode> create(AudioContext*, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels);
+    static PassRefPtrWillBeRawPtr<ScriptProcessorNode> create(AudioContext*, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels);
 
     virtual ~ScriptProcessorNode();
 
@@ -63,6 +63,11 @@ public:
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(audioprocess);
 
+#if ENABLE(OILPAN)
+    virtual void clearKeepAlive() OVERRIDE;
+#endif
+
+    void trace(Visitor*);
 
 private:
     virtual double tailTime() const OVERRIDE;
@@ -78,8 +83,8 @@ private:
     void swapBuffers() { m_doubleBufferIndex = 1 - m_doubleBufferIndex; }
     unsigned m_doubleBufferIndex;
     unsigned m_doubleBufferIndexForEvent;
-    Vector<RefPtr<AudioBuffer> > m_inputBuffers;
-    Vector<RefPtr<AudioBuffer> > m_outputBuffers;
+    WillBeHeapVector<RefPtrWillBeMember<AudioBuffer> > m_inputBuffers;
+    WillBeHeapVector<RefPtrWillBeMember<AudioBuffer> > m_outputBuffers;
 
     size_t m_bufferSize;
     unsigned m_bufferReadWriteIndex;
@@ -91,6 +96,20 @@ private:
 
     // Synchronize process() with fireProcessEvent().
     mutable Mutex m_processEventLock;
+
+#if ENABLE(OILPAN)
+    // AudioNodes are still reference counted but they are in the
+    // oilpan heap because the ScriptProcessorNode is an EventTarget.
+    // This self-persistent keeps the object from being deleted
+    // until the reference count reaches zero.
+    //
+    // It is safe to drop the self-persistent when the ref count
+    // of a ScriptProcessorNode reaches zero. At that point, the
+    // ScriptProcessor node is removed from the AudioContext and
+    // it cannot be reattached. Therefore, the reference count
+    // will not go above zero again.
+    OwnPtr<Persistent<AudioNode> > m_keepAlive;

[Mads Ager (chromium), 2014/04/03 08:39:33]

This has to be in AudioNode. When the ref count in AudioNode is larger than 0 it
should have this keep alive. When it is 0 the keep alive should be deallocated.
Once this is in AudioNode you can use the GC_PLUGIN_IGNORE to get the plugin to
allow it.

[keishi, 2014/04/08 02:33:40]

Done.

+#endif
 };
 
 } // namespace WebCore