Compute the tail time for an IIRFilter from its coefficients

third_party/WebKit/Source/platform/audio/IIRFilter.h

Index: third_party/WebKit/Source/platform/audio/IIRFilter.h
diff --git a/third_party/WebKit/Source/platform/audio/IIRFilter.h b/third_party/WebKit/Source/platform/audio/IIRFilter.h
index de2d3c6b8bee9cbfc10fe25db6dc118485fb0859..173d21e846792d877ad63ef6c1d7c240d9d53dbd 100644
--- a/third_party/WebKit/Source/platform/audio/IIRFilter.h
+++ b/third_party/WebKit/Source/platform/audio/IIRFilter.h
@@ -30,6 +30,12 @@ class PLATFORM_EXPORT IIRFilter final {
                             float* mag_response,
                             float* phase_response);
 
+  // Compute the tail time of the IIR filter
+  double TailTime(double sample_rate);
+
+  // Reset the internal state of the IIR filter to the initial state.
+  void ResetState();
+
  private:
   // Filter memory
   //