helper to convert CGImage -> SkImage

BUG=skia:

Change-Id: I07e0b8fe510d34ab541de7572cb6775478527624
Reviewed-on: https://skia-review.googlesource.com/6386
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/gm/aaclip.cpp b/gm/aaclip.cpp
index 683f5ff..e9d4476 100644
--- a/gm/aaclip.cpp
+++ b/gm/aaclip.cpp
@@ -199,9 +199,10 @@
 
     SkBitmap bm2;
     SkCreateBitmapFromCGImage(&bm2, image);
-    CGImageRelease(image);
-
     canvas->drawBitmap(bm2, 10, 120);
+    canvas->drawImage(SkMakeImageFromCGImage(image), 10, 120 + bm2.height() + 10);
+
+    CGImageRelease(image);
 }
 
 class CGImageGM : public skiagm::GM {
@@ -243,10 +244,7 @@
 private:
     typedef skiagm::GM INHERITED;
 };
-
-#if 0 // Disabled pending fix from reed@
-DEF_GM( return new CGImageGM; )
-#endif
+//DEF_GM( return new CGImageGM; )
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////