Change SkImageDecoders to take an SkStreamRewindable.

src/images/SkMovie_gif.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkMovie.h"
@@ skipping 414 matching lines @@
 
     // save index
     fLastDrawIndex = lastIndex;
     return true;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "SkTRegistry.h"
 
-SkMovie* Factory(SkStream* stream) {
+SkMovie* Factory(SkStreamRewindable* stream) {
     char buf[GIF_STAMP_LEN];
     if (stream->read(buf, GIF_STAMP_LEN) == GIF_STAMP_LEN) {
         if (memcmp(GIF_STAMP,   buf, GIF_STAMP_LEN) == 0 ||
                 memcmp(GIF87_STAMP, buf, GIF_STAMP_LEN) == 0 ||
                 memcmp(GIF89_STAMP, buf, GIF_STAMP_LEN) == 0) {
             // must rewind here, since our construct wants to re-read the data
             stream->rewind();
             return SkNEW_ARGS(SkGIFMovie, (stream));
         }
     }
     return NULL;
 }
 
-static SkTRegistry<SkMovie*(*)(SkStream*)> gReg(Factory);
+static SkTRegistry<SkMovie*(*)(SkStreamRewindable*)> gReg(Factory);