Call rewindIfNeeded in SkCodec

src/codec/SkCodec_libgif.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCodec_libgif.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 438 matching lines @@
     for (uint32_t i = colorCount; i < maxColors; i++) {
         colorPtr[i] = colorPtr[fFillIndex];
     }
 
     fColorTable.reset(new SkColorTable(colorPtr, maxColors));
     copy_color_table(dstInfo, this->fColorTable, inputColorPtr, inputColorCount);
 }
 
 SkCodec::Result SkGifCodec::prepareToDecode(const SkImageInfo& dstInfo, SkPMColor* inputColorPtr,
         int* inputColorCount, const Options& opts) {
-    // Rewind if necessary
-    if (!this->rewindIfNeeded()) {
-        return kCouldNotRewind;
-    }
-
     // Check for valid input parameters
     if (opts.fSubset) {
         // Subsets are not supported.
         return kUnimplemented;
     }
     if (!conversion_possible(dstInfo, this->getInfo())) {
         return gif_error("Cannot convert input type to output type.\n",
                 kInvalidConversion);
     }
 
@@ skipping 192 matching lines @@
 }
 
 int SkGifCodec::onNextScanline() const {
     if (fGif->Image.Interlace) {
         return get_output_row_interlaced(this->INHERITED::onNextScanline(), this->dstInfo().height());
     } else {
         return this->INHERITED::onNextScanline();
     }
 }