Move SkCodec::Origin into its own file

It is now used by SkPixmap and will soon be in SkJpegEncoder. No need
for those to depend on SkCodec.

Bug: 768878
TBR=reed@google.com
(reed@ already approved the API change in
https://skia-review.googlesource.com/60721)
Change-Id: If1a6e1d5b60a7a3d8c97818e15a48d28ba804668
Reviewed-on: https://skia-review.googlesource.com/61680
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
diff --git a/src/codec/SkCodec.cpp b/src/codec/SkCodec.cpp
index c3d99f2..59978c6 100644
--- a/src/codec/SkCodec.cpp
+++ b/src/codec/SkCodec.cpp
@@ -128,7 +128,7 @@
 
 SkCodec::SkCodec(int width, int height, const SkEncodedInfo& info,
         XformFormat srcFormat, std::unique_ptr<SkStream> stream,
-        sk_sp<SkColorSpace> colorSpace, Origin origin)
+        sk_sp<SkColorSpace> colorSpace, SkEncodedOrigin origin)
     : fEncodedInfo(info)
     , fSrcInfo(info.makeImageInfo(width, height, std::move(colorSpace)))
     , fSrcXformFormat(srcFormat)
@@ -142,7 +142,8 @@
 {}
 
 SkCodec::SkCodec(const SkEncodedInfo& info, const SkImageInfo& imageInfo,
-        XformFormat srcFormat, std::unique_ptr<SkStream> stream, Origin origin)
+        XformFormat srcFormat, std::unique_ptr<SkStream> stream,
+        SkEncodedOrigin origin)
     : fEncodedInfo(info)
     , fSrcInfo(imageInfo)
     , fSrcXformFormat(srcFormat)