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..1e63ddd79c06be9d33542caba6598d05253510d9 100644
--- a/Source/core/platform/audio/HRTFPanner.h
+++ b/Source/core/platform/audio/HRTFPanner.h
@@ -26,6 +26,7 @@
 #define HRTFPanner_h
 
 #include "core/platform/audio/FFTConvolver.h"
+#include "core/platform/audio/HRTFDatabaseLoader.h"
 #include "core/platform/audio/Panner.h"
 #include "modules/webaudio/DelayDSPKernel.h"
 
@@ -33,7 +34,7 @@ namespace WebCore {
 
 class HRTFPanner : public Panner {
 public:
-    explicit HRTFPanner(float sampleRate);
+    HRTFPanner(float sampleRate, HRTFDatabaseLoader*);
     virtual ~HRTFPanner();
 
     // Panner
@@ -53,6 +54,8 @@ private:
     // and azimuthBlend which is an interpolation value from 0 -> 1.
     int calculateDesiredAzimuthIndexAndBlend(double azimuth, double& azimuthBlend);
 
+    RefPtr<HRTFDatabaseLoader> m_databaseLoader;
+
     float m_sampleRate;
 
     // We maintain two sets of convolvers for smooth cross-faded interpolations when