Remove uses of SkImageDecoder from gms

gm/copyTo4444.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 
 #include "Resources.h"
 #include "SkCanvas.h"
-#include "SkImageDecoder.h"
 #include "SkOSFile.h"
 
 namespace skiagm {
 
 /**
  *  Test copying an image from 8888 to 4444.
  */
 class CopyTo4444GM : public GM {
 public:
     CopyTo4444GM() {}
 
 protected:
     virtual SkString onShortName() {
         return SkString("copyTo4444");
     }
 
     virtual SkISize onISize() {
         return SkISize::Make(1024, 512);
     }
 
     virtual void onDraw(SkCanvas* canvas) {
         SkBitmap bm, bm4444;
-        SkString pngFilename = GetResourcePath("mandrill_512.png");
-        if (!SkImageDecoder::DecodeFile(pngFilename.c_str(), &bm, kN32_SkColorType,
-                                        SkImageDecoder::kDecodePixels_Mode)) {
+        if (!GetResourceAsBitmap("mandrill_512.png", &bm)) {
             SkDebugf("Could not decode the file. Did you forget to set the "
                      "resourcePath?\n");
             return;
         }
         canvas->drawBitmap(bm, 0, 0);
         SkAssertResult(bm.copyTo(&bm4444, kARGB_4444_SkColorType));
         canvas->drawBitmap(bm4444, SkIntToScalar(bm.width()), 0);
     }
 
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new CopyTo4444GM; }
 static GMRegistry reg(MyFactory);
 
 }