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

Source/modules/webaudio/DynamicsCompressorNode.cpp

Index: Source/modules/webaudio/DynamicsCompressorNode.cpp
diff --git a/Source/modules/webaudio/DynamicsCompressorNode.cpp b/Source/modules/webaudio/DynamicsCompressorNode.cpp
index 787c78bb9d4d18e6b46f2e859132239788766d9c..94beccd739dce8bd40cba69764e0f5f3d7f19598 100644
--- a/Source/modules/webaudio/DynamicsCompressorNode.cpp
+++ b/Source/modules/webaudio/DynamicsCompressorNode.cpp
@@ -108,6 +108,11 @@ void DynamicsCompressorNode::uninitialize()
     AudioNode::uninitialize();
 }
 
+void DynamicsCompressorNode::clearInternalState()
+{
+    m_reduction->setValue(0);

[Raymond Toy, 2014/10/21 19:28:56]

Any other state we want to clear here? 

[hongchan, 2014/10/21 20:20:37]

The other parameters are user-modifiable. I believe the reduction value is the
only value that needs to be zeroed.

+}
+
 double DynamicsCompressorNode::tailTime() const
 {
     return m_dynamicsCompressor->tailTime();