Expose setting API to set ImageAnimationPolicy(Allowed, Once, None)

Source/platform/graphics/BitmapImageTest.cpp

Index: Source/platform/graphics/BitmapImageTest.cpp
diff --git a/Source/platform/graphics/BitmapImageTest.cpp b/Source/platform/graphics/BitmapImageTest.cpp
index 4cf2369232db00ecea69623befdcc1d0ed1208f1..71f19d21578a7c48418bf29ede614cf930b91199 100644
--- a/Source/platform/graphics/BitmapImageTest.cpp
+++ b/Source/platform/graphics/BitmapImageTest.cpp
@@ -54,6 +54,8 @@ public:
         virtual void didDraw(const Image*) override { }
         virtual bool shouldPauseAnimation(const Image*) override { return false; }
         virtual void animationAdvanced(const Image*) override { }
+        virtual void imageAnimationPolicy(const Image*, ImageAnimationPolicy&) override { }
+
         virtual void changedInRect(const Image*, const IntRect&) { }
 
         int m_lastDecodedSizeChangedDelta;