SkImage method for detecting lazy decoding

include/core/SkImage.h

Index: include/core/SkImage.h
diff --git a/include/core/SkImage.h b/include/core/SkImage.h
index 2a62135bdb303ccdfaa852707a50b082fa324b40..5b9e2031758f8ebc317041289a0603f8113d1ece 100644
--- a/include/core/SkImage.h
+++ b/include/core/SkImage.h
@@ -288,6 +288,12 @@ public:
      */
     bool asLegacyBitmap(SkBitmap*, LegacyBitmapMode) const;
     
+    /**
+     *  Returns true if the image is backed by an image-generator or other src that creates
+     *  (and caches) its pixels / texture on-demand.
+     */
+    bool isLazyGenerated() const;
+
 protected:
     SkImage(int width, int height, uint32_t uniqueID);