Add getYUV8Planes() API to SkCodec

src/codec/SkCodecImageGenerator.h

Index: src/codec/SkCodecImageGenerator.h
diff --git a/src/codec/SkCodecImageGenerator.h b/src/codec/SkCodecImageGenerator.h
index 80eacb19c885544c5e93bdec605e5725d91b5da5..d2c74ab48295a171f2358a1130be9d37f9646707 100644
--- a/src/codec/SkCodecImageGenerator.h
+++ b/src/codec/SkCodecImageGenerator.h
@@ -39,5 +39,11 @@ private:
     SkAutoTDelete<SkCodec> fCodec;
     SkAutoTUnref<SkData> fData;
 
+    // FIXME: These fields are necessary only until we change the API of SkImageGenerator
+    //        to match SkCodec.  Once the API is changed, they should be removed.
+    int fYWidth;
+    int fUWidth;
+    int fVWidth;
+
     typedef SkImageGenerator INHERITED;
 };