Implement a computeFastBounds() traversal for SkImageFilter. This allows for correct culling of pri…

include/core/SkPaint.h

Index: include/core/SkPaint.h
diff --git a/include/core/SkPaint.h b/include/core/SkPaint.h
index 7dc3a4e03ccefb56e802b26fe4e38ee1d6a3a9e7..ab93eac1023617ae11cecca2fa8bc325c1a93d5e 100644
--- a/include/core/SkPaint.h
+++ b/include/core/SkPaint.h
@@ -943,6 +943,7 @@ public:
             uintptr_t effects = reinterpret_cast<uintptr_t>(this->getLooper());
             effects |= reinterpret_cast<uintptr_t>(this->getMaskFilter());
             effects |= reinterpret_cast<uintptr_t>(this->getPathEffect());
+            effects |= reinterpret_cast<uintptr_t>(this->getImageFilter());
             if (!effects) {
                 return orig;
             }