Revert of Remove uses of SkImageDecoder from gms

gm/downsamplebitmap.cpp

Index: gm/downsamplebitmap.cpp
diff --git a/gm/downsamplebitmap.cpp b/gm/downsamplebitmap.cpp
index a99bae0cd998937cec663fef3d29fcef9d0f07da..771eb6ab53d34c8b75ae246b777eb3f09e850e45 100644
--- a/gm/downsamplebitmap.cpp
+++ b/gm/downsamplebitmap.cpp
@@ -10,6 +10,7 @@
 #include "Resources.h"
 #include "SkGradientShader.h"
 #include "SkTypeface.h"
+#include "SkImageDecoder.h"
 #include "SkStream.h"
 #include "SkPaint.h"
 
@@ -170,11 +171,21 @@
       int fSize;
 
       void make_bitmap() override {
-        if (!GetResourceAsBitmap(fFilename.c_str(), &fBM)) {
-            fBM.allocN32Pixels(1, 1);
-            fBM.eraseARGB(255, 255, 0 , 0); // red == bad
-        }
-        fSize = fBM.height();
+          SkImageDecoder* codec = nullptr;
+          SkString resourcePath = GetResourcePath(fFilename.c_str());
+          SkFILEStream stream(resourcePath.c_str());
+          if (stream.isValid()) {
+              codec = SkImageDecoder::Factory(&stream);
+          }
+          if (codec) {
+              stream.rewind();
+              codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
+              delete codec;
+          } else {
+              fBM.allocN32Pixels(1, 1);
+              *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
+          }
+          fSize = fBM.height();
       }
   private:
       typedef DownsampleBitmapGM INHERITED;