Enable Oilpan by default for webaudio/

Source/modules/webaudio/AudioNode.h

Index: Source/modules/webaudio/AudioNode.h
diff --git a/Source/modules/webaudio/AudioNode.h b/Source/modules/webaudio/AudioNode.h
index 8bf98958866bcfb454808e36db0afaa9a729f0a6..d2219d6b72fa72104c6bc3f5a9c8c71b0e8c1426 100644
--- a/Source/modules/webaudio/AudioNode.h
+++ b/Source/modules/webaudio/AudioNode.h
@@ -50,7 +50,7 @@ class ExceptionState;
 // Most processing nodes such as filters will have one input and one output, although multiple inputs and outputs are possible.
 
 // AudioNode has its own ref-counting mechanism that use RefTypes so we cannot use RefCountedGarbageCollected.
-class AudioNode : public NoBaseWillBeGarbageCollectedFinalized<AudioNode>, public EventTargetWithInlineData {
+class AudioNode : public GarbageCollectedFinalized<AudioNode>, public EventTargetWithInlineData {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AudioNode);
 public:
     enum { ProcessingSizeInFrames = 128 };
@@ -97,12 +97,6 @@ public:
     String nodeTypeName() const;
     void setNodeType(NodeType);
 
-#if !ENABLE(OILPAN)
-    // Can be called from main thread or context's audio thread.
-    void ref();
-    void deref();
-#endif
-
     // This object has been connected to another object. This might have
     // existing connections from others.
     // This function must be called after acquiring a connection reference.
@@ -198,7 +192,7 @@ public:
 protected:
     // Inputs and outputs must be created before the AudioNode is initialized.
     void addInput();
-    void addOutput(PassOwnPtrWillBeRawPtr<AudioNodeOutput>);
+    void addOutput(AudioNodeOutput*);
 
     // Called by processIfNecessary() to cause all parts of the rendering graph connected to us to process.
     // Each rendering quantum, the audio data for each of the AudioNode's inputs will be available after this method is called.
@@ -211,10 +205,10 @@ protected:
 private:
     volatile bool m_isInitialized;
     NodeType m_nodeType;
-    RefPtrWillBeMember<AudioContext> m_context;
+    Member<AudioContext> m_context;
     float m_sampleRate;
-    WillBeHeapVector<OwnPtrWillBeMember<AudioNodeInput> > m_inputs;
-    WillBeHeapVector<OwnPtrWillBeMember<AudioNodeOutput> > m_outputs;
+    HeapVector<Member<AudioNodeInput> > m_inputs;
+    HeapVector<Member<AudioNodeOutput> > m_outputs;
 
     double m_lastProcessingTime;
     double m_lastNonSilentTime;
@@ -222,6 +216,16 @@ private:
 #if !ENABLE(OILPAN)
     // Ref-counting
     volatile int m_normalRefCount;
+
+    // AudioNodes are in the oilpan heap but they are still reference counted at
+    // the same time. This is because we are not allowed to stop the audio
+    // thread and thus the audio thread cannot allocate objects in the oilpan
+    // heap.
+    // The m_keepAlive handle is used to keep a persistent reference to this
+    // AudioNode while someone has a reference to this AudioNode through a
+    // RefPtr.
+    GC_PLUGIN_IGNORE("")
+    Persistent<AudioNode> m_keepAlive;
 #endif
     volatile int m_connectionRefCount;
 
@@ -235,6 +239,10 @@ private:
     static unsigned s_instanceCount;
 
 #if !ENABLE(OILPAN)
+    // Can be called from main thread or context's audio thread.
+    void ref();
+    void deref();
+
     virtual void refEventTarget() OVERRIDE FINAL { ref(); }
     virtual void derefEventTarget() OVERRIDE FINAL { deref(); }
 #endif