SkImage method for detecting lazy decoding

src/image/SkImage_Raster.cpp

Index: src/image/SkImage_Raster.cpp
diff --git a/src/image/SkImage_Raster.cpp b/src/image/SkImage_Raster.cpp
index 120c397e82ea7efb61c233458c9994960f235a0d..51bc6f03e2930d9a60a25aebf155a77315ca2412 100644
--- a/src/image/SkImage_Raster.cpp
+++ b/src/image/SkImage_Raster.cpp
@@ -93,6 +93,10 @@ public:
         SkASSERT(fBitmap.isImmutable());
     }
 
+    bool onIsLazyGenerated() const override {
+        return fBitmap.pixelRef() && fBitmap.pixelRef()->isLazyGenerated();
+    }
+
 private:
     SkImage_Raster() : INHERITED(0, 0, kNeedNewImageUniqueID, NULL) {
         fBitmap.setImmutable();