add ImageGenerator::NewFromData to porting layer

src/c/sk_surface.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 "sk_canvas.h"
 #include "sk_data.h"
 #include "sk_image.h"
@@ skipping 212 matching lines @@
 
 sk_image_t* sk_image_new_raster_copy(const sk_imageinfo_t* cinfo, const void* pixels,
                                      size_t rowBytes) {
     SkImageInfo info;
     if (!from_c_info(*cinfo, &info)) {
         return NULL;
     }
     return (sk_image_t*)SkImage::NewRasterCopy(info, pixels, rowBytes);
 }
 
-#include "SkDecodingImageGenerator.h"
-
 sk_image_t* sk_image_new_from_data(const sk_data_t* cdata) {
-    SkImageGenerator* gen = NULL;
-#if 0
-    // enable this when SkDecodingImageGenerator is available in chrome (decode codecs)
-    gen = SkDecodingImageGenerator::Create(AsData(cdata), SkDecodingImageGenerator::Options());
-#endif
-    if (NULL == gen) {
-        return NULL;
-    }
-    return ToImage(SkImage::NewFromGenerator(gen));
+    return ToImage(SkImage::NewFromData(AsData(cdata)));
 }
 
 sk_data_t* sk_image_encode(const sk_image_t* cimage) {
     return ToData(AsImage(cimage)->encode());
 }
 
 void sk_image_ref(const sk_image_t* cimage) {
     AsImage(cimage)->ref();
 }
 
@@ skipping 435 matching lines @@
     sk_image_t* cimage = sk_surface_new_image_snapshot(csurface);
     
     // HERE WE CROSS THE C..C++ boundary
     canvas->drawImage((const SkImage*)cimage, 20, 20, NULL);
     
     sk_path_delete(cpath);
     sk_paint_delete(cpaint);
     sk_image_unref(cimage);
     sk_surface_unref(csurface);
 }