add runtime option to provide data->imagegenerator factory

src/image/SkImage.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
@@ skipping 58 matching lines @@
 }
 
 SkData* SkImage::refEncoded() const {
     return as_IB(this)->onRefEncoded();
 }
 
 SkImage* SkImage::NewFromEncoded(SkData* encoded, const SkIRect* subset) {
     if (NULL == encoded || 0 == encoded->size()) {
         return NULL;
     }
-    SkImageGenerator* generator = SkImageGenerator::NewFromData(encoded);
+    SkImageGenerator* generator = SkImageGenerator::NewFromEncoded(encoded);
     return generator ? SkImage::NewFromGenerator(generator, subset) : NULL;
 }
 
 SkSurface* SkImage::newSurface(const SkImageInfo& info, const SkSurfaceProps* props) const {
     if (NULL == props) {
         props = &as_IB(this)->props();
     }
     return as_IB(this)->onNewSurface(info, *props);
 }
 
@@ skipping 201 matching lines @@
 
 SkImage* SkImage::NewFromAdoptedTexture(GrContext*, const GrBackendTextureDesc&, SkAlphaType) {
     return NULL;
 }
 
 SkImage* SkImage::NewFromTextureCopy(GrContext*, const GrBackendTextureDesc&, SkAlphaType) {
     return NULL;
 }
 
 #endif