expose direct methods for decoding to an image

These are meant to contrast MakeFromEncoded(), and emphasize that it is deferred/cached,
while the new methods are not.

Change-Id: I83ac22394cb14cdc84ff8507a514bf708734b84f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/234476
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index 98892fd..6a833c6 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -10,6 +10,8 @@
 
  * SkDrawLooper is no longer supported in SkPaint or SkCanvas.
 
+ * SkImage: new factories: DecodeToRaster, DecodeToTexture
+
  * SkImageFilter API refactor started:
    - Provide new factory API in include/effects/SkImageFilters
    - Consolidated enum types to use SkTileMode and SkColorChannel