Support multiple HRTFDatabases for different sample-rates

Source/core/platform/audio/HRTFPanner.h

Index: Source/core/platform/audio/HRTFPanner.h
diff --git a/Source/core/platform/audio/HRTFPanner.h b/Source/core/platform/audio/HRTFPanner.h
index 235f82be0dfed8b33e1346b0759325a689b764a1..4fe4e40319aba074285c00d6636a46991b720013 100644
--- a/Source/core/platform/audio/HRTFPanner.h
+++ b/Source/core/platform/audio/HRTFPanner.h
@@ -31,9 +31,11 @@
 
 namespace WebCore {
 
+class HRTFDatabase;
+
 class HRTFPanner : public Panner {
 public:
-    explicit HRTFPanner(float sampleRate);
+    HRTFPanner(float sampleRate, HRTFDatabase*);
     virtual ~HRTFPanner();
 
     // Panner
@@ -53,6 +55,8 @@ private:
     // and azimuthBlend which is an interpolation value from 0 -> 1.
     int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend);
 
+    HRTFDatabase* m_database;
+
     float m_sampleRate;
 
     // We maintain two sets of convolvers for smooth cross-faded interpolations when