Remove SkEncodedInfo kUnknown_Color and kUnknown_Alpha from public API

src/codec/SkWebpCodec.h

Index: src/codec/SkWebpCodec.h
diff --git a/src/codec/SkWebpCodec.h b/src/codec/SkWebpCodec.h
index 908bf2cd4fc71d39d387055bb08766a060a2f066..60ab8330a670de0feab2472a92cf9dff6efa71e0 100644
--- a/src/codec/SkWebpCodec.h
+++ b/src/codec/SkWebpCodec.h
@@ -34,6 +34,8 @@ protected:
 
     bool onGetValidSubset(SkIRect* /* desiredSubset */) const override;
 private:
+    static bool ReadHeader(SkStream* stream, SkCodec** outCodec);

[msarett, 2016/04/25 14:59:10]

Leon, do you remember why SkWebpCodec doesn't need to override onRewind()?

[scroggo, 2016/04/25 15:10:43]

It doesn't store any information locally. e.g. SkPngCodec has a png_struct etc,
which it needs to delete and recreate. But SkWebCodec has nothing like that.

[msarett, 2016/04/25 15:18:21]

Acknowledged.

+
     SkWebpCodec(int width, int height, const SkEncodedInfo&, SkStream*);
 
     typedef SkCodec INHERITED;