Use proper row step in SkRawCodec

src/codec/SkRawCodec.cpp

Index: src/codec/SkRawCodec.cpp
diff --git a/src/codec/SkRawCodec.cpp b/src/codec/SkRawCodec.cpp
index f400b19d89ed0b4eb6a6dba3afedc316d9bf8e5e..da3c28c549ff617cc74df0effb9ff18177eca023 100644
--- a/src/codec/SkRawCodec.cpp
+++ b/src/codec/SkRawCodec.cpp
@@ -508,7 +508,7 @@ SkCodec::Result SkRawCodec::onGetPixels(const SkImageInfo& requestedInfo, void*
     buffer.fPlaneStep = 1;
     buffer.fPixelType = ttByte;
     buffer.fPixelSize = sizeof(uint8_t);
-    buffer.fRowStep = sizeof(srcRow);
+    buffer.fRowStep = width * 3;
 
     for (int i = 0; i < height; ++i) {
         buffer.fArea = dng_rect(i, 0, i + 1, width);