add ImageGenerator::NewFromData to porting layer

tools/Resources.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Resources.h"
 #include "SkBitmap.h"
 #include "SkCommandLineFlags.h"
 #include "SkData.h"
-#include "SkDecodingImageGenerator.h"
+#include "SkImageGenerator.h"
 #include "SkOSFile.h"
 
 DEFINE_string2(resourcePath, i, "resources", "Directory with test resources: images, fonts, etc.");
 
 SkString GetResourcePath(const char* resource) {
     return SkOSPath::Join(FLAGS_resourcePath[0], resource);
 }
 
 void SetResourcePath(const char* resource) {
     FLAGS_resourcePath.set(0, resource);
 }
 
 bool GetResourceAsBitmap(const char* resource, SkBitmap* dst) {
     SkString resourcePath = GetResourcePath(resource);
     SkAutoTUnref<SkData> resourceData(
             SkData::NewFromFileName(resourcePath.c_str()));
-    return resourceData && SkInstallDiscardablePixelRef(
-            SkDecodingImageGenerator::Create(
-                    resourceData, SkDecodingImageGenerator::Options()), dst);
+    return resourceData && SkInstallDiscardablePixelRef(resourceData, dst);
 }