Make reduction value of dynamics compressor zero when no sources are connected

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 91d368353e26ed52ef03b2f56d4b0dbfb02eae97..ebe11a520819fabfb9736b2eb93b565e17b93615 100644
--- a/Source/modules/webaudio/AudioNode.h
+++ b/Source/modules/webaudio/AudioNode.h
@@ -120,6 +120,14 @@ public:
     virtual void initialize();
     virtual void uninitialize();
 
+    // Clear internal state when the node is disabled. When a node is disabled,
+    // it is no longer pulled so any internal state is never updated. But some
+    // nodes (DynamicsCompressorNode) have internal state that is still
+    // accessible by the user. Update the internal state as if the node were
+    // still connected but processing all zeroes. This gives a consistent view
+    // to the user.
+    virtual void clearInternalStateWhenDisabled();
+
     bool isInitialized() const { return m_isInitialized; }
 
     unsigned numberOfInputs() const { return m_inputs.size(); }