Enable Oilpan by default for webaudio/

Source/platform/audio/AudioDSPKernel.h

Index: Source/platform/audio/AudioDSPKernel.h
diff --git a/Source/platform/audio/AudioDSPKernel.h b/Source/platform/audio/AudioDSPKernel.h
index a006864acd585a3962c8af5870099bfe3043c3d0..ff9d0945d8f7c23ed659f945e660a9ed13ce0324 100644
--- a/Source/platform/audio/AudioDSPKernel.h
+++ b/Source/platform/audio/AudioDSPKernel.h
@@ -67,6 +67,12 @@ public:
     virtual double latencyTime() const = 0;
 
 protected:
+    // Oilpan: This raw pointer is safe because the AudioDSPKernelProcessor object is guaranteed

[tkent, 2014/08/15 07:39:01]

nit: I recommend to wrap code comments in 80 columns.

[haraken, 2014/08/15 08:08:00]

Done.

+    // to be kept alive while the AudioDSPKernel object is alive.
+    // Ideally we want to move the AudioDSPKernel hierarchy to the heap and use
+    // a Member<AudioDSPKernelProcessor>. However, we cannot do that because AudioDSPKernel can be
+    // allocated in audio threads (which are not registered to Oilpan).
+    GC_PLUGIN_IGNORE("")
     AudioDSPKernelProcessor* m_kernelProcessor;
     float m_sampleRate;
 };