Revert of Revert ""Revert of eliminate config param -- it was always self's config (https://codereview.chromi…

include/core/SkPixelRef.h

Index: include/core/SkPixelRef.h
diff --git a/include/core/SkPixelRef.h b/include/core/SkPixelRef.h
index 579ca5b7e8d5a7e83837e5b69fc7bb3d662195cc..8319ec6da5acd7776e00b623938f4215fbb7d648 100644
--- a/include/core/SkPixelRef.h
+++ b/include/core/SkPixelRef.h
@@ -223,13 +223,14 @@
 
     /**
      *  Makes a deep copy of this PixelRef, respecting the requested config.
+     *  @param config Desired config.
      *  @param subset Subset of this PixelRef to copy. Must be fully contained within the bounds of
      *         of this PixelRef.
      *  @return A new SkPixelRef, or NULL if either there is an error (e.g. the destination could
      *          not be created with the given config), or this PixelRef does not support deep
      *          copies.
      */
-    virtual SkPixelRef* deepCopy(const SkIRect* subset = NULL) {
+    virtual SkPixelRef* deepCopy(SkBitmap::Config config, const SkIRect* subset = NULL) {
         return NULL;
     }