SkImage::NewFromGenerator(SkImageGenerator*), and a unit test.

include/core/SkImage.h

Index: include/core/SkImage.h
diff --git a/include/core/SkImage.h b/include/core/SkImage.h
index 581129e7207fd58a3311f9d161a372a6eefdd46a..1316e2b595e9814749a0867e083a48be61196f98 100644
--- a/include/core/SkImage.h
+++ b/include/core/SkImage.h
@@ -16,6 +16,7 @@
 
 class SkData;
 class SkCanvas;
+class SkImageGenerator;
 class SkPaint;
 class GrContext;
 class GrTexture;
@@ -47,6 +48,13 @@ public:
      */
     static SkImage* NewTexture(const SkBitmap&);
 
+    /**
+     *  Construct a new SkImage based on the given ImageGenerator.
+     *  This function will always take ownership of the passed
+     *  ImageGenerator.  Returns NULL on error.
+     */
+    static SkImage* NewFromGenerator(SkImageGenerator*);
+
     int width() const { return fWidth; }
     int height() const { return fHeight; }
     uint32_t uniqueID() const { return fUniqueID; }