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/include/utils/mac/SkCGUtils.h b/include/utils/mac/SkCGUtils.h
index 29df8b8..592f2f6 100644
--- a/include/utils/mac/SkCGUtils.h
+++ b/include/utils/mac/SkCGUtils.h
@@ -10,6 +10,7 @@
 
 #include "SkSize.h"
 #include "SkImageInfo.h"
+#include "SkImage.h"
 
 #if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
 
@@ -32,7 +33,9 @@
  *
  *  On failure, return false, and leave bitmap unchanged.
  */
-SK_API bool SkCreateBitmapFromCGImage(SkBitmap* dst, CGImageRef src, SkISize* scaleToFit = NULL);
+SK_API bool SkCreateBitmapFromCGImage(SkBitmap* dst, CGImageRef src);
+
+SK_API sk_sp<SkImage> SkMakeImageFromCGImage(CGImageRef);
 
 /**
  *  Copy the pixels from src into the memory specified by info/rowBytes/dstPixels. On failure,