Oilpan: WebAudio: Prepare to move AudioProcessor hierarchy to Oilpan heap.

Source/modules/webaudio/BiquadProcessor.cpp

Index: Source/modules/webaudio/BiquadProcessor.cpp
diff --git a/Source/modules/webaudio/BiquadProcessor.cpp b/Source/modules/webaudio/BiquadProcessor.cpp
index 2aa3eefe13e75609af48bb188251712b146fdd23..477d2ca159ff8df8dc537f72560fe5b534e2700c 100644
--- a/Source/modules/webaudio/BiquadProcessor.cpp
+++ b/Source/modules/webaudio/BiquadProcessor.cpp
@@ -60,6 +60,15 @@ BiquadProcessor::~BiquadProcessor()
         uninitialize();
 }
 
+void BiquadProcessor::trace(Visitor* visitor)
+{
+    visitor->trace(m_parameter1);
+    visitor->trace(m_parameter2);
+    visitor->trace(m_parameter3);
+    visitor->trace(m_parameter4);
+    AudioDSPKernelProcessor::trace(visitor);
+}
+
 PassOwnPtr<AudioDSPKernel> BiquadProcessor::createKernel()
 {
     return adoptPtr(new BiquadDSPKernel(this));